Add maven support.

[#68640224]

[#68640326]
License finder for gradle projects [#68729858]
Ignore gradle generated artifacts [#68729858]
Don't shell out in unit tests
Merge branch 'java'
Raise warning if running 'license_finder approve' with no arguments
Add Gradle to Travis
Fix gradle installation on travis
force travis to build...
overriding install settings on travis causes not to install gems
change gem owner's email
Add CocoaPods support [#68802058]