Added example callback system
Added note about setting variables
Added a short description.
Fixed a typo.
Removed also block
Fixed some grammar nastiness
Merge pull request #4 from monokrome/master

Fixed some documentation issues
Fixed a typo.
Changed some weird wording.
Added more information regarding why variable access is useful.
Fixed a typo.
Fixed some grammar issues.
Added more information about plugin observation
MOVE DAT COMMENT UP!
Imported everything from vim into vimpy.
Added Plugin and PluginObservor into vimpy module.
Fixed wrap width.
Modified docs to use vimpy.Plugin
Modified variables to support "in" operator.
Check to verify files are not locked when changing.