Release 7.8.1

Support DSA SSH Private Keys

Numerous fixes / compatibility changes fixes for the release scripts:
  
  + Python 2.7.9 support (SSL hostname checking)
  + Docker 1.4.1 support (stricter requirementswhen using `-t`)
  + Use gosu instead of sudo
  + Setuptools 8 support (support canonical Python versioning)
  + Fix a few bugs in the version checking script