Add method to generate random point near a specified point

http basic auth and geocoder.us

Allow proxy configuration settings to include protocol

http_proxy & https_proxy settings can now be specified with or without
the protocol prefix.

Add error checking for Mapquest lookup (tests included)

Fix maxmind results from reserved response

Merge branch 'over_query_limit_cache' of git://github.com/rodzyn/geocoder into rodzyn-over_query_limit_cache

Allow Mapquest API version to be specified

Fixes #493.

They may fail on Travis CI because of quota issues with providers.

allow query text that is actually an array.

Describe preload+joins option for overcoming includes issue.

In face of this known issue, .joins(...).preload(...) felt like a slightly better option (vs. :select option passed to .near()) for just the particular use case I'm up against where includes would have been useful. 

Thought it'd be worth adding to the docs, especially as preload() isn't widely demonstrated in Rails own docs.

Update module name for near_scope_options in docs for :near scope