add missing #include <thrust/gather> to kdtree_cuda_3d_index.cu

Added python wrapper for add_points and remove_point methods.

create cmake config files on install

fix trailing space in CMakeLists

don't search for dependencies if already disabled

Allow flann to build with VS2015

Flann was causing an error when building against VS2015. Aparentely the
basic serializer for __int64 is being defined twice.

Fix deletion in kmeans_index.h

Fix memory leaks in kmeans_index.h

Updated comments in lsh_index

It still had some comments from randomized kd-tree comments

C wrapper fix for C++99

Added index methods to C wrapper

Specifically the methods:
  * `addPoints`
  * `removePoint`
  * `getPoint`
  * `veclen`
  * `size`
  * `usedMemory`

Fixed compilation on Ubuntu 12.04

Sorry about last PR, this has been verified now

Added stdint.h so SIZE_MAX is defined

Solves a compilation issue for Ubuntu 12.04

result_set bugfix

fix constructor and deconstructor of the node of the hierarchical_clu…

Efficient compression

FLANN uses much less RAM when decompressing saved index files. Should be backwards compatible with original index type.

This bug will cause the serialization of the hierarchical_clustering_index to crash. Because when saving the index, the pivot and pivot_index for the top node of each tree is not initializaed. then when load these top nodes, pivot = obj->points_[pivot_index]; will cause error that index is out of range.