Fix url to full percent encoding when replying.

* Don't know why this isn't done by default with `encodeURI` or `encodeURIComponent` but needs to be done otherwise we end up with `Re#comment-146b1dd0263):` when a script name and/or discussion has parens in it.
Merge pull request #252 from Martii/fixReplyParensWithMardown

Fix url to full paren percent encoding when replying.