New iconfont build including tag icon.

References #188
New build of legacy IE stylesheet.
Add button for tag selection to entry editor.

Only displayed if freetag plugin is installed.

References #188
Add basic functionality to open tags selection in magnficPopup.

References #188
Required style for freetag in magnificPopup.

These should at some point go into the plugin's CSS.

References #188
Prevent freetag list from making the page "jump".

References #188
Merge branch '2.0' of github.com:s9y/Serendipity into 2.0