set version (there was none!)
major cleanup of 'setup.py'

* set version as `asterisk.__version__` (it was using `None`)
* remove all the processing crap (of README, description, license,
  download URL)
* make PEP8 compliant
rename old README
remove old and obsolete doc, make and install files
rename package 'asterisk' to 'py_asterisk'
replace 'pyst' with 'py-Asterisk' or 'py_asterisk'
add basic README
setup: change fields of author and project URL
declared Python compatibility and development status