Start using c-blosc 1.4.0
Removing old c-blosc sources
Adding subtree of c-blosc in master
subtree merge blosc v1.4.0
Added support for different compressors via c-blosc 1.4.  Lots of other improvements from BLZ project as well.
subtree merge blosc v1.4.1
Added a free_cachemem() method
Added tests for different compressors; and in some benchmarks too.