Added a module to convert textual emoticons :-) to Unicode emoji

This is a module built from Rose Pritchard's Emoticons module. The big
difference is that instead of using a set of GIF images, this module
replaces common emoticons with the HTML entity for the corresponding
Unicode emoji.
Removed unnecessary files
Fixed parse_urls regex and added support for optional “clean” category URL
Removed malformed syntax – nested forms.
System-wide support for Unicode emoticons
Removed obsoleted `foreach`
Fixed a little error in the `foreach`
Merge pull request #177 from xenocrat/develop

System-wide support for Unicode emotions and fixes to the Categorize module