Remove unwanted cython generated file
ENH sparse csc matrices indice, indptr and data are 1d
ENH more descriptive name
ENH explicit initialization
ENH deallocate memory
Remove unused varible + clarify some variable name
ENH rename i_ to more conventional p
COSMIT use range instead of xrange
Remove unused varibale
ENH simplify code path
TST imporve tree equality assertion
ENH use appropriate type ofr index
ENH explicit name
ENH extract binary search from code
ENH use memcopy
Merge pull request #2 from arjoly/tree-sparse-imp

Some improvement to sparse input support