simple declarative services osgi service and client

ds-pom

	<dependencies>
		<dependency>
			<groupId>org.osgi</groupId>
			<artifactId>org.osgi.core</artifactId>
			<version>4.2.0</version>
			<scope>provided</scope>
		</dependency>
  </dependencies>
  	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.felix</groupId>
				<artifactId>maven-bundle-plugin</artifactId>
				<version>3.3.0</version>
				<extensions>true</extensions>
				<configuration>
					<instructions>
						<Bundle-SymbolicName>${project.artifactId}</Bundle-SymbolicName>
						<Bundle-Category>sample</Bundle-Category>
						<Service-Component>OSGI-INF/component.xml</Service-Component>
						<Export-Package>
							com.x.echo.api
						</Export-Package>

					</instructions>
				</configuration>
			</plugin>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<version>3.3</version>
				<configuration>
					<source>1.7</source>
					<target>1.7</target>
				</configuration>
			</plugin>

		</plugins>