Add unittest file for TriangleSimilarityMatcher
Add config file for YouCompleteMe
Add feature detection for triangle similarity

This detects stars using the FAST algorithm. A set of triangles is then formed
by exhaustively enumerating all distinct triples of stars. The matching
algorithm (to come next) is based on comparing the similarity of these
triangles.
Add matching test for triangle similarity

A basic translation unit test for the triangle similarity matcher.