Search Field Wrapper Reusability

* generic search field wrapper styling for reusability

* custom search wrapper styles for:
	* user role filter
	* home search (this will change when other fields are added)

* commented out `$text-direction: ltr` because I kept getting a Sass 3.2 deprecation error.

* close `x` icon for clearing search field

Conflicts:
	modules/UshahidiUI/media/js/app/templates/UserList.html
Home Page Search

* centers search wrapper on home page, until other elements are wired up. This can be easily adjusted when that time comes.
Merging changes from #266 in without all the conflicts
Rebuilt style and test/style after merge