updated NuPIC installation readme
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.
Updating path to nupic-default.xml
Updated comment in logging conf
Merge pull request #1598 from rhyolight/update-testdb

Updating path to nupic-default.xml
updated readme w/ info for contributors
Merge pull request #1582 from BoltzmannBrain/new_readme

updated NuPIC installation readme
fixed variable name in spatial_pooler.py comments
Merge pull request #1603 from BoltzmannBrain/sp_typo

spatial_pooler.py comments typo
Updates nupic.core to 64f7abb2903120a253d634d8d15dcbca4ca8dca7.
Merge pull request #1607 from numenta-ci/core-update-sha

Updates nupic.core to latest built SHA.