Fix comment delete on user profile page
Fixed flash message and scroll to last pos on post

When a form is submitted when the user is scrolled down
the page (like for deleting a comment) it's jarring to
be scrolled back to the top of the page.

To remedy this the flash message is placed in fixed
position and the user is kept at their previous scroll
position after a POST.
Merge pull request #201 from mreinhardt/fixed-flash

Fixed pos flash message, scroll to prev pos, fix comment delete on user prof