0.8b2: Improve coverage measurements of multiprocessing functional tests.

Fix pex binary distribution replacing subprocess rendering with
multiprocessing as pex cannot deal with shellscripts on packages.
Major code reorganization, cleanup and code simplification.
Implement simple debug levels. Make default conf.py and index.rst
configurable.

0.8b1

Make travis happy

0.7.4

sphinxserve-linux pex sha1: 588c5218a04938ec5d8066194e2c1e54579a093a
Build automatically done at https://travis-ci.org/mzdanieltest/sphinxserve/jobs/78936451

sphinxserve-osx pex sha1: d7ec9ae88cdbffbe03bf8b3fffbd0a3430a2369b
Build automatically done at https://travis-ci.org/mzdanieltest/sphinxserve/jobs/78936453

0.7.3

sphinxserve pex sha1: 6c497248432f57815d215f24461e3b8afafa3696

Build automatically done at https://hub.docker.com/r/mzdaniel/sphinxserve-pex/builds/b8uqgps8muktsww9qbddcun

0.7.2

sphinxserve pex sha1: 7372db20393cf33179f8232cecce353b36cc9857

Build automatically done at https://hub.docker.com/r/mzdaniel/sphinxserve-pex/builds/bpnzguq2mdfkxd5wfj9fci6

0.7.1

sphinxserve pex sha1: 4f8d451e461978637f1fb9febe1c3837d87f1505

Build automatically done at https://hub.docker.com/r/mzdaniel/sphinxserve-pex/builds/b3ttruv5nmxfyhgygmmbp4e