Add .travis.yml and wait_for_emulator.

Based on https://github.com/embarkmobile/android-maven-example
Only download android-16.
Remove tests and specific programmatic support for android 1.5 style sdk.

Only require android-16 / 4.1.2.
Run the samples afterwards.
Point the build to the correct repo.
Change link to CI server.
Merge pull request #203 from hugojosefson/travis-ci

Travis CI