* Add tests
Starting work on #141, which points out that 2017 should come out
"twenty seventeen"; it currently comes out "two thousand seventeen".
* Handle English years properly.
Resolves#141.
* Whoops -- didn't PEP-8 my tests
* Handle years MORE properly...with suffixes!
- Rendering years between 10-99 was bugged (e.g. "zero fifty").
Fixed that by thinking outside the high/low text box I had made.
- Added suffixes: default none if positive, 'BC' if negative.
User-overrideable.
Antonio GurgelandErnesto Rodriguez Ortiz