Merge pull request #71 from celeduc/master

Fix rspec coverage bug
Merge pull request #73 from celeduc/master

Properly express license in gemspec
fixed spec bug for no tests
updated version and release notes
Merge pull request #76 from angelasilva/75_rspec_bug_for_no_tests

75_rspec_bug_for_no_tests
added rainbow extensions for string
updated release note and version
Merge pull request #78 from Sage/fix_rainbow_requirement

added rainbow extensions for string
Add link to prior change
Clean up gemspec/Gemfile syntax, remove rubyforge reference.