Fixes #609. Bing seems to support this type of character escaping now.
It's not discussed in their documentation but it works with every query
I've tried so hopefully we're finally good on this issue.

Also remove some unnecessary assertions from tests.

No longer seems to exist.

Add badges.

The README was just way too long.

Fixes #1299.

add ruby 2.4 and 2.5 to travis

and remove separate #latitutde and #longitude methods (which are defined
in base Result class).

Merge branch 'feature/postcodes_io' of git://github.com/sledge909/geocoder into sledge909-feature/postcodes_io