give a change to define mongodb in local_settings
BUGFIX: make TEMPLATE_DIRS a tuple
changes to allow mongo settings within local settings
upadted mongo connection to use connection url to allow authenticated connections
added port and used dict for url formatting
pep8 to force travis test
added cludless earth map and removed natural earth 2 - fixes #1113 [ci skip]
prettify [ci skip]
Merge pull request #1128 from modilabs/mongo_local_settings

Allow mongo db setting override from within local settings