Fix exec-maven-plugin configuration issue

fixes #133

spring-boot-starters/spring-boot-starter-parent/pom.xml

@@ -31,108 +31,108 @@
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
-                <classifier>tests</classifier>
+				<version>${spring-boot.version}</version>
+				<classifier>tests</classifier>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-actuator</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-amqp</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-aop</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-actuator</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-batch</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-data-jpa</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-integration</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-jdbc</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-jetty</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-logging</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-mobile</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-redis</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-security</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-shell-remote</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-test</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-tomcat</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-web</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 			<dependency>
 				<groupId>org.springframework.boot</groupId>
 				<artifactId>spring-boot-starter-websocket</artifactId>
-				<version>0.5.0.BUILD-SNAPSHOT</version>
+				<version>${spring-boot.version}</version>
 			</dependency>
 		</dependencies>
 	</dependencyManagement>
@@ -222,9 +222,7 @@
 					<groupId>org.codehaus.mojo</groupId>
 					<artifactId>exec-maven-plugin</artifactId>
 					<configuration>
-						<manifest>
-							<mainClass>${start-class}</mainClass>
-						</manifest>
+						<mainClass>${start-class}</mainClass>
 					</configuration>
 				</plugin>
 				<plugin>