Make error message when failing to run process more obvious
Don't include the message when we fail to install the android bundle

The message just says "failed to run bash; stdout & stderr have been piped
Don't print a stack trace when android bundle fails to install
Avoid running ensure_android twice on failure
Be clear that we need a JDK, not just the JRE
Merge branch 'android_tweaks' into release-0.9.2