Add tests for suit_row_attributes with request
Make suit_row_attributes accept a request parameter

This makes it possible to add attributes on the rows depending on the
request data, such as the authenticated user.
Update docs for suit_row_attributes with request
Fixed box-shadows for Mac/Safari
Migrated development to Mac having newer lessc compiler therefore
compiled CSS files have every line modified because of removed
trailing semicolon. Actual changes of this commit can be seen by
.less file.
Added CSS for media=print. Reposition/hide unnecessary elements
Delete accidentaly compiled .css file
Version bump to 0.2.3 and changelog updates
Adding the ability to show or hide columns in change_list_results.
Fixed cookie format and allowed a default set of columns to be shown; also
made this feature togglable in the model admin.