Add entries to .gitignore
Remove _overlap_wrapper.c
Remove overlap.py, will be replaced by Cython file
Add overlapArea.h
Add _overlap.pyx
Change overlap wrapper to Cython
Remove a test function that I committed accidentally.
Fix test_overlap
Install Cython on travis-ci
Make `compute_overlap` a wrapper around `_compute_overlap`.
Merge pull request #22 from cdeil/cython

Use Cython to wrap C overlap area code