Created MethodDependency class.
Created MethodDependency class.

Wrote/copied over install, list_all_filepaths, and clean code
from CodeResourceRevision to Method.

Modified CodeResourceRevision's remove_helper method to match.

cfe-lab/Kive,cfe-lab/Kive,cfe-lab/Kive,cfe-lab/Kive,cfe-lab/Kive