Added suppport for multiple compressors in Blosc 1.3.0
Separate compression/decompression times
Added timing for a plain np.copy()
Added some docstrings in benchmark
Added compressor_list() to the actuall set of public functions
Added notes for new 1.2.0 release
Ops, fixing a bug with timings in benchmark
More beautification of the output of the benchmark (will ever end?)
need to set the PYTHONPATH explicitly

While it is true, that Python automatically add the current directory to the
PYTHONPATH, current direcory actually means the base directory of the script
that is being executed, in this case, the ``bench`` sub directory.

zsh» python bench/compare-pack-ptr.py
Traceback (most recent call last):
  File "bench/compare-pack-ptr.py", line 18, in <module>
    import blosc
ImportError: No module named blosc

1 zsh» PYTHONPATH=. python bench/compare-pack-ptr.py
Creating a large NumPy array with 10**7 int64 elements:
  [      0       1       2 ..., 9999997 9999998 9999999]
  Time for copying array with numpy.copy():     0.031 s

Using *** blosclz *** compressor::
  Time for pack_array/unpack_array:     0.117/0.086 s.Compr ratio: 136.24
  Time for compress_ptr/decompress_p    tr: 0.012/0.014 s.Compr ratio: 136.83
Merge pull request #56 from esc/new-compressors

need to set the PYTHONPATH explicitly
fix two typos
Be consistent with the use of ifs
Compiling all sources if Blosc library is not specified.  A C++ compiler is required now in this case.
Merge pull request #57 from esc/new-compressors

fix two typos
Merge pull request #55 from FrancescAlted/new-compressors

Added suppport for multiple compressors in Blosc 1.3.0