Make !reload more helpful about missing/incorrect plugin names
Provide clearer feedback about plugin reloading process
Fix test breakage
Better error checking and feedback for !load and !unload
Use less ambiguous wording about loaded plugins
Add a forgotten docstring
Use pretty unicode bullets for plugin list markers
Strip whitespace from args when issuing !reload
Improve formatting in formatted_plugin_list
Pass --no-clean to pip invocation during setup.py install

Without this option, calling pip while setup.py install is being run
results in pip deleting the build directory, causing the entire install
process to fail with difficult to debug errors about files being
missing. This fixes #179
Merge pull request #211 from zoni/plugin_botcmds

Improve !reload, !load and !unload
Provide better feedback around automatic 3to2 installation
Merge pull request #219 from zoni/issue/179

Pass --no-clean to pip invocation during setup.py install
Documented Python 3.3 as minimum req for the py3 track