Changed since pull request was submitted.

Also add test for method presence in all lookups.

This code appears to be copied from the Freegeoip lookup, where it is
undesirable to begin with.

Conflicts:
	test/lookup_test.rb

Conflicts:
	README.rdoc
	lib/geocoder.rb
	lib/geocoder/configuration.rb

Fix query params escaping for OauthUtil

Conflicts:
	lib/geocoder/query.rb

Conflicts:
	lib/geocoder/query.rb

Cache is now lookup-specific.

Make Geocoder.configure accept a hash (now preferred) and add
Geocoder.config method (for reading config). Deprecate old syntax.

instead of instance variables.

Previously they were testing many things which were not configuration.
All we care about is whether settings are read/writeable via the methods
provided.

Conflicts:
	lib/geocoder/lookups/base.rb
	lib/geocoder/lookups/yahoo.rb
	lib/geocoder/query.rb

add #route to google result parser

Support for X_REAL_IP and X_FORWARDED_FOR

For discussion see:
https://github.com/alexreisner/geocoder/issues/329

Fixes the problem described here:
https://github.com/mongoid/mongoid/issues/2579

This should be reverted when the Mongoid issue (or whatever it is)
is fixed.

Geocoder should be required after other things like Rails and Mongoid.

Document uninitialized constant error with Mongoid.