Remove unnecessary gitignore statements
Fix and update Maven build files

This fixes a compilation error caused by usage of api level 17 methods
when the version was still at 16.
It updates the target Android platform/version to 4.4_r1/19
Since the artifacts for this version are not available from Maven Central
it is required to deploy them locally. See android-maven-sdk-deployer.
Update versions for dependencies

This updates actionbarsherlock to 4.4.0 and android-maven-plugin to 3.8.0
Note that android-maven-plugin requires at least Maven 3.1.1
Update targetSdk and versionName
Add project.properties files

These files are required for Eclipse to pick up the correct target sdk
level after importing the projects.