Project migration to Android Studio.

- Move external libaries to /libraries.
- Update .gitignore files.
- Ignore auto gen files and folders.
Remove jars and update gradle.

- Add min/max sdk to gradle build file.
- Remove app versioning from manifest
Added gradle equivalent of the projects
Update readme
update compilesdkversion to 20 and build version to 20
Removed launch activities. - Manifest merge issues.
remove minsdkversions from manifest. Now in build.gradle
Update README.md

Add urls.
Update README.md
add slidingpanel and viewpagerindicator libraries as gradle dep
Merge branch 'android-studio-migration' of github.com:mipreamble/barterli_android into android-studio-migration

* 'android-studio-migration' of github.com:mipreamble/barterli_android:
  Update README.md
  Update README.md
Update readme / add attributions
Merge pull request #88 from mipreamble/android-studio-migration

Android studio migration