[doc] Add matplotlib's sphinx extension `plot`
[setup] Let cython embed call signature into doc string
[setup,doc] Add metadata in setup.py

o add doc/abstract.txt for the long package description
[pypmc] bump version to 0.9
[doc] Update doc strings in source code

o reflect ``embed_signature`` change
o beautify sphinx output
o correct indentation
[doc] Major overhaul

o add separate pages for introduction, installation, user guide
o user guide still incomplete
[setup] Remove codecs.open to fix python3 build
[pypmc] Fix build from source distribution

o no longer require cython
o add MANIFEST.in to copy over ez_setup into tarball