travis-ci integration

MSP-10800
Update version for branch

MSP-10800
Add CodeClimate badge

MSP-10800
Add coveralls.io integration

MSP-10800
Add Gemnasium badge

MSP-10800
Rubygems badge

MSP-10800
Fix JRuby build

MSP-10800

Use correct database adapter for JRuby.
Add Inch CI badge

MSP-10800
Add PullReview badge

MSP-10800
Remove extra CodeClimate badge

MSP-10800

Copy and paste error.
Use rake release for releases instead of tagging

MSP-10800

Now that metasploit-credential is public, `rake release` can be used to
release gems to rubygems instead of having to manually create the tag.
Update the CONTRIBUTING.md Release steps to reflect this change.
Merge branch 'chore/MSP-10800/public-integrations'

MSP-10800