exposes a function that lets use, show, hide, and remove dom objects based on current users username

cleaning up some whitespace changes

adding newline to end of applition.html.haml

adding newline to end of _current_user_js.html.haml
Merge pull request #32 from dvito/wip_62_edit_delete_comment

Moves hiding/showing the edit/delete/reply links to javascript function thats reusable across the application