Rename Visitor class to CobraModuleVisitor
Rename Visitor.cobra file to CobraModuleVisitor.cobra
Forgot to include this in the previous commit
Remove commented code from completion extension
Remove more old commented/debugging code
Comment out debugging information in CobraModuleVisitor
Add explicit reference to System.Core before parsing/binding
Initial commit of files to be used as test data

These source files are not part of the addin, but are to be used
by test methods inside the various classes that are actually part
of the addin.
Add tests to CompilerManager.parseAndBind method

Lock down existing functionality with the CompilerManager class.

Note that adding these tests revealed that binding errors are not
currently being reported back to MonoDevelop (i.e. no squiggly
lines appear for type mismatch and other binding errors).