PyEditor save actions: auto-update module level __updated__ variable + 1 Bug Fix

**New feature**: PyEditor save actions. First action updates a module level date field.

**Bug-fix**: code font unreadable on OS X for Aptana Themes Python scopes help text.

Switch to using FontUtils and IFontUsage which were introduced earlier when similar problems erupted for specific dialogs on OS X. Doesn't change anything on Linux and Windows actually, but makes it so the desired intent is mirrored on OS X.

FontUtils version bumped to 0.2

Screenshots showcasing both can be found on my [changelog](http://github.com/andreberg/Pydev/wiki/Changelog) wiki entry.