cleaning up setup.py
replacing streamcorpus_pipeline/config.py with yakonfig
renaming throughout streamcorpus-pipeline
   extractor --> reader
   loader --> writer

These new names are much more clear and unambiguous.
renaming throughout streamcorpus-pipeline
   extractor --> reader
   loader --> writer

on one more file
no longer including large tagged output files in the .egg and .tar.gz
distributed through pypi.python.org
Merge branch 'master' of https://github.com/trec-kba/streamcorpus-pipeline
renaming extractor --> reader one more (trivial)