Added fork button to sidebar. Corrected spacing bug in front page of docs.
REFACTOR: moving tests from hand-rolled testing to py.test framework. Tests now run to completion and .travis.yml has been updated to reflect their current structure. However, the current tests are often not useful. For example the test for Seq do not yet test the order of process execution.
Added temporary TODO file to keep track of the refactoring of tests.
Commented out wsgiref requirement. The CSP library itself does not import this, but it isn't clear why pip freeze thinks the package is necessary. FIXME: either remove, refactor or fix the package on Python 3.3 where pip fails to install it (see travis-ci run 9.2).
Minor improvements in formatted, references to documentation elsewhere.