Travis CI, Version Badge, and secure Gemfile

Added Version Badge to README
Added Travis CI Status Image to README
Updated .travis.yml to support 1.9.3 or later
Added secure source to Gemfile

	modified:   .travis.yml
	modified:   Gemfile
	modified:   README.textile
Formatted badges to fit on one line
Added .travis.yml whitelist
Merge pull request #179 from AJ-Acevedo/master

Travis CI, Version Badge, and secure Gemfile