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"...'
Merge pull request #345 from seuros/master

Version 3.0.0.alpha
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.
Merge pull request #307 from vjt/patch-1

Wrap data attributes in single quotes
Textarea now takes cancel_button_class, ok_button_class and inner_class into account
Merge pull request #355 from pjmartorell/master

Textarea now takes cancel_button_class, ok_button_class and inner_class into account
use strict in bip.purr
use concat instead of <<
convert specs to expect syntax
renamed helper
clean up helper.
Use string javascript syntax.
[WIP] deprecate old syntax to match convention
Fix helper tests and remove deprecation warnings
add new test app folders to .gitignore
fix display_with on nil issue

Fix an issue that wasn’t applying the helper method to a value if it
started out as nil