Added SUPERVISOR_UNIX_SOCKET_FILE
Added supervisor - needed for supervisor xmlrpc calls
Added add_process_group, remove_process_group, and calls to these methods from models.py when activating or deactivating a twitterfilter.  Fixes #154
Added back change from #158
cosmetic
Moved code to write a single twitterfilter supervisor process config file, to a utils.py method
utils.py
Added reload config, renamed filename to processname.  Added sleep between stop and remove
Added sleep after create conf file, added reload_config before adding process group
Added exception handing to swallow exceptions in the following cases: adding a process that's already added; removing a process that is already stopped or isn't a known process
tweaked examples/layout in settings template following review of pull request, refs #154
Merge pull request #216 from gwu-libraries/t154-supervisord-xmlrpc

T154 supervisord xmlrpc