code cleanups
code cleanups

Move project_dist_path, is_stack_project and stack_dist_path into
the SublimeHaskellBuilderCommand class. Improves encapsulation.

bscottm/SublimeHaskell,SublimeHaskell/SublimeHaskell,SublimeHaskell/SublimeHaskell,bscottm/SublimeHaskell