Print rvm version in standard images

This version is common to all images
List Python versions

~travis/virtualenv shows aliases as well
Also show the compile time options for the default version of Python
and modules installed by pip
Install OpenJDK 6 for Android images

Some Android apps require it; getting around it is easy,
but would require sudo doing so.

See https://github.com/travis-ci/travis-ci/issues/2678