Include all keywords in test
Simplify keyword parsing
Implement syntax tree classes for transfer keywords
Add (failing) test for transforming transform keywords
Transform Rip::Nodes::{Exit,Raise,Return}
Replace Rip::Nodes::Raise with correct Rip::Nodes::Throw
General code cleanup
Move Rip::Utilities::Keywords.{exiter,transfer}
Remove unused keywords
Normalize transform keywords
Add tests to cover Rip::Nodes::Class transformation
Transform Rip::Nodes::Class even without any superclasses
Move Rip::Nodes::Class#{arguments,superclasses}
Fix Rip::Nodes::Class normalization