BK-797 Aloha plugin for table management
BK-1320 Popup window does not show when user selects link in the editor
BK-1321 Toolbar plugin should be able to accept custom styles in the dropdown menu
BK-1323 Reformat README and setup file

`setup.py` is now fully `pep8` compliant

As part of http://24pullrequests.com/
BK-1323 Reformat README and setup file

Updated README

The README.txt was renamed to README.md to present it nicely on Github.
Also updated the README itself and included some links and stuff.

As part of http://24pullrequests.com/
Merge branch '2.0' of git://github.com/sourcefabric/Booktype into 2.0
Fix some out of date links in the readme