Add dependencies for python bindings.
Clean up and static types.
More efficient indexing.
Merge pull request #8 from AlexanderFabisch/cleanup-cmake

Cleanup cmake
Merge branch 'master' of github.com:AlexanderFabisch/OpenANN
Merge branch 'master' of github.com:OpenANN/OpenANN
Merge pull request #9 from AlexanderFabisch/cleanup-python

Cleanup python