Update .travis.yml

Removes the uploading of archives from travis.

(otherwise every pull request would upload a new snapshot (but fails anyway))
Update .travis.yml

This script will not uploadArchive for PR's from other forks, but will for all changes where we have the rights.

Helped:
https://groups.google.com/forum/#!topic/travis-ci/Fe2xSVg_cZg
http://docs.travis-ci.com/user/pull-requests/
change the RobolectricPlugin because getRuntimeJarList has been deprecated.
Update Gradle wrapper to v.1.12.
Replace deprecated `groovy` with `compile`.
Convert line endings from CRLF to LF.