Add "classifier" support to apklib goal

Hi guys,

I've been happily using "classifier" support for apk builds, but found this was missing from apklib builds. I have copied across the implementation from apk. In order for this to work, it also requires that the classifier is applied to the jar build as well:

				<plugin>
					<groupId>com.jayway.maven.plugins.android.generation2</groupId>
					<artifactId>android-maven-plugin</artifactId>
					<version>3.5.2-SNAPSHOT</version>
					<extensions>true</extensions>
					<configuration>
						<sdk>
							<platform>${android.platform}</platform>
						</sdk>
						<classifier>${o2.classifier}</classifier>
					</configuration>
				</plugin>

				<plugin>
					<artifactId>maven-jar-plugin</artifactId>
					<executions>
						<execution>
							<id>default-jar</id>
							<configuration>
								<classifier>${o2.classifier}</classifier>
							</configuration>
						</execution>
					</executions>
				</plugin>

But if the classifier is applied to both apklib & jar it works a treat.

Regards,

Mark