Refactored the buildfile module.
Refactored the buildfile module to make each build file wrapper more self
contained.
Added a warning when running pyke from the test script.
Updated buildfile.PythonFileWrapper
Updated the PythonFileWrapper so that it no longer generated byte code for
the build files that get loaded.
Due to the user facing impact of change (their projects are no longer
polluted with __pycache__ directories) the version number has been bumped
up one.
Copyright statement was also updated to reflect that it is now 2013.