RTL support

I have added basic RTL (right-to-left, as in hebrew, arabic...) support for Addari.
Attached are all the needed files for adding RTL support for this theme.

List of changes :
- Created style-rtl.css that overrides the directionality properties of both master.css and style.css
- Patch against master.css to add /* LTR */ comments to all the lines that are getting overridden by style-rtl.css
- Patch against style.css to add /* LTR */ comments to all the lines that are getting overridden by style-rtl.css
- Created flipped image 62-rtl.gif
- Created flipped image quote-rtl.gif
- Tiny patch against node.tpl.php that changes Tags to <?php print t('Tags')?>: so it is translatable.
- Bonus : added some styling to user picture in comments (style.css line 754)

This is NOT thoroughly tested, meaning it is tested and looks good on all the major browsers (IE6+, FF, Chrome, safari, Opera) but not in every condition possible so there might be some fixes here and there to be done.