Bump up Ruby version for Travis to 2.1.2

Switch to byebug for MRI 2.x debugging.

Switch to byebug for MRI 2.x debugging.  Debugger is not supported for 2.1.2 and up, and was never fully 2.x compatible.

Use correct fixtures in tests and make required changes so tests pass.

Response to GH issues #579 and #663.

use more forgiving 'unstructured' query format in Bing Locations API

See docs: http://msdn.microsoft.com/en-us/library/ff701711.aspx

See: http://docs.travis-ci.com/user/languages/ruby/

allow to pass in language/locale parameter on per request base

This reverts commit 1098046f, reversing
changes made to 8c066874.

Fix: Maxmind migration generator failed on rolling back

Fixes on MaxMind

Readme update for Geocoder.cache usage

[2nd try] fixes postgres "unknown OID" warnings

This reverts commit 2a29613a, reversing
changes made to c5c45940.