Regular users were unable to update task time.

Added 'time' to user_actions task array.
Update helpers.php, function a()

In helpers.php is a function a() used for link generation, i. e. by markdown(). In the opening <a> element was a /, which is ignored by many (all? most?) browsers, but leads to interesting result with jQuery inserting of HTML generated by that function.

I stumbled upon this while developing code for a preview of textareas and not being able to show a link to a task (#1).
First version of CSS and JS files which actually could be usable. This most certainly needs some more polishing, but first use them on the comment textareas ot validate.
Now using a previewable comment addition textarea! How cool is that? ;)
Merge branch 'master' into feature_markdown_preview