Updated h2o.order to produce (by default) indexes based on 1 instead of zero
Added missing put key in RemoveVec.
Few chunks updates:

1) Removed redundant constructor in CXDChunk.
2) Updated NewChunk to take min sparse ratio as argument
3) marked transient chunk members as transient.
svm light parse fix: fixed numbering (vector group numbering) of newly created vecs so that in case of vector group reuse (multiple uploads of the same file path) we do not overwrite previous data.
Updated matrix multiplication to use standard NewChunk.compress instead of explicitly making C8D and CXD chunks..