Updated syntax + colons + spell checking

Does the same thing as #6, however it supplements the syntax file with the following:

 - Now colors "foo::bar" class references (when they are not part of any other statement). Now the 'include blah' lines look a little prettier!
 - Disables spell checking in a few areas, where it makes sense. I didn't do any spell version checking, so I'm not sure about compatibility with any vim older than version 7.