Added coverall and pypi version badges to the file.
Fixed language in credits file. Removed Björn Larsson from the list of contributors.
Fixed all documentation internal links by adding the :class: directive
everywhere that it was missing and adding the correct namespaces.
Merged Master into the current branch
Added a .coveragerc file to control the configuration of the coverage
tests. Added configuration to use the coverall service for builds
running on travis.
Fixed a doctest failure due to a bad indentation.
Include branches in coverage and removed the NotImplementedException
line from coverage.