Using pkg_resources to load local config files.

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.
Using 'nupic.support' ns to store config in pkg_resources
Merge pull request #1596 from rhyolight/configuration-pkg-resources

Using pkg_resources to load local config files.