FIX LSH: Fill up candidates uniformly from remaining indices
Added KNeighborsMixin, RadiusNeighborsMixin.
Added tests for graph methods.
ENH improve LSHF scalability example
FIX Fixed benchmark.

ENH Added error bars to scalability example plots.
ENH Added error bars to scalability example plots.
FIX Fixed ordering of returned neighbors.
DOC: explain the importance of iid index and queries in bench script
ENH: ensure that max hash size and hash dtype are consistent
DOC Modified documentation of approximate neighbors.
FIX Fixed example.
ENH Modified hyperparameters example to calculate stadard deviations of accuracies.
ENH Modified approximate neighbors doc string.
ENH Changed doc string and comments in test_distance function.
ENH more LSH scalability example and doc improvements
ENH Used GaussianRandomProjectionHash for handling hashing.
ENH Changed description of hyper-parameters example.
ENH Inlined _create_tree method.
DOC fix LSH forest docstrings

trees_ and original_indices_ are public members of LSHForest.
ENH Modified kneighbors and radius_neighbors methods.