Detect android-maven-plugin with new groupId

The groupId of the plugin changed to com.simpligility.maven.plugins, so
we have to return the plugin if it uses the new groupId.
Add test for new android-maven-plugin groupId

This test verifies that a project using the new version of AMP can be
configured with m2e-android.
Updated instructions to avoid stalled builds.

Updated instructions to avoid stalled builds due to Google ADT update usage dialogue boxes.
Merge pull request #277 from WonderCsabo/275_supportNewAndroidMavenPluginGroupId

Support for new Android Maven Plug-in.