Fixed bad API call to jQuery.atr()

Not sure if this problem still exists upstream, but the buggy version makes '<a className="close"...' instead of '<a class="close"...'
-Removed useless files
-Bumped version to 3.0.0.alpha
-Namespaced helper methods
-Fixed tests
-Dropped support for old version of rails
-Correct dependency on actionpack only
Merge pull request #345 from seuros/master

Version 3.0.0.alpha
updated jquery elastic to latest version
allow to set id, closes #122
Added best_in_place_unless
Merge pull request #347 from seuros/master

Update for version 3.0.0
Display html in editor when sanitize is enabled

To resolve issue #219
Merge pull request #348 from the-robear/master

Display html in editor when sanitize is enabled
Merge pull request #303 from davad/patch-1

Fixed bad API call to jQuery.attr()
Wrap data attributes in single quotes

To avoid breakage when passing along JSON serialized data.