Better wording

darcs-hash:20090108160457-58252-25e95ce9e77aa7068811b98dac71ada140557729
Included automatic Cython compilation in setup.py script:

 * Reverted from setuptools to distutils
 * Have Cython file automatically compiled and re-compiled if any of its
   sub-files changes
 * Have extension module recompiled automatically if PJSIP was recompiled
 * Updated documention
 * Updated debian rules

darcs-hash:20090108184616-58103-97f7488bd77db1b52191aea9857da336f4003f31