Using pkg_resources to load local config files.

Fixes #1593. WIP. 

Includes moving nupic-default.xml and nupic-logging.conf into
nupic/support and loading them with pkg_resources. The default config
file is only loaded with pkg_resources if it is not found with the
NTA_CONF_PATH.
@scottpurdy I just realized there's a flaw in my logic becasue the configFilePath is never used below. 

Is there any reason that a user would provide their own logging config file? Should I account for that case or can I just remove the option?