Android as first class citizen on Travis CI

Preview on travis-ci/travis-ci#1395
potential fix? for build error on travis

[ERROR] error: error reading /home/travis/.m2/repository/org/ow2/asm/asm-commons/4.1/asm-commons-4.1.jar; invalid LOC header (bad signature)
Merge pull request #195 from roboguice/gildegoma-welcome-android-on-travis

Gildegoma welcome android on travis