Initial commit

* Adds a ActiveRecord plugin called acts_as_html_sanitizer, which hooks into the before_validation hook
* Works with Rails 3.2 - 4.1
Ignore lockfile for gemfile
Added Travis CI configuration

* Configured to run against MRI Ruby 1.9.3 - 2.1.1, JRuby (in 1.9 mode) and Rubinius, as well as Rails v3.2, 4.0 and 4.1
Removing duplication of the SQLite3 gem
Removed unused tasks directory
Added badges for Code Climate, RubyGems and Travis CI