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
Merge pull request #211 from zoni/plugin_botcmds

Improve !reload, !load and !unload