Makes TimeNormalizer throw an exception on more than 2 parses, and fixes redundancies in grammar revealed by this change
Uses ISO week of year, not aligned week of year, for displaying week-based times.
Improves sample grammar and adds in a few more annotation errors and expected failures
Adds support for quarters
Adds a few rules to the sample grammar, adds a few more annotation errors and known failures, and adds another tokenization special case for YYMMDD tokens