Add sleep option for geocode rake task.

This is too much detail for the top of the README.

Add notes on accuracy and data types to README (original issue #477)

https://github.com/alexreisner/geocoder/issues/477

Fixes issue #478. This level of detail is excessive as a default.

Should be part of system-wide git ignore config.

Support for Data Science Toolkit (DSTK) lookup.

This commit adds the Data Science Toolkit as a lookup type.  The DSTK behaves identically to the Google Maps API with the exception that it can be run behind your own firewall.  More information about this tool can be found here: http://www.datasciencetoolkit.org/

Update link to freegeoip documentation, .md instead of .rst

Add Rails 4 and Ruby 2.

Addresses issue #450. Wish we had sample response to see exactly what
data was returned, but we don't.

Allow custom naming of distance and bearing columns.

Update README to reflect bounding box optimization

Fix for AutoexpireCacheDalli urls

Updated README: FreeGeoIP quota

Add an example: CacheBypass

added units example to docs

This was causing unintended resuce from other exceptions like:
Errno::ECONNREFUSED: Connection refused - Unable to connect to Redis...

rack/utils is not a dependency and therefore cannot be required.