Add libgeoip-dev to the apt-get install

libgeoip-dev is needed by the following pip install geoip
Bump to version 1.0.0-rc6
Add stable string to changelog
Design a set of default test decks.
Update the README section on running test decks to reflect the new decks
Add libgeoip also to travis build script
Merge branch 'david-fixdeps'

* david-fixdeps:
  Add libgeoip also to travis build script
  Add libgeoip-dev to the apt-get install
Fix install instructions for debian based systems.