* Rewrote signature matching for fused cpdef function dispatch to use a pre-built tree index in a mutable default argument and be O(n).

* Added test to ensure proper differentiation between ambiguously compatible and definitely compatible arguments.

* Added test to ensure fused cpdef's can be called by the module itself during import.

* Added test to ensure consistent handling of ambiguous fused cpdef signatures.

* Test for explicitly defined fused cpdef method.

* Add .komodoproject to .gitignore.

* Add /cython_debug/ to .gitignore.

Closes #1385.