Quieter debugging messages

At this point, I no longer need to know which repetitions were
recognized.  This helps highlight which ones were not recognized.
Support repetition phrases with month names

Phrases such as "July" or "January and February" are not particularly
common by themselves.  However, they're often used as compound rules
in other phrases such as "second tuesday in July".  An upcoming commit
will support the latter.
Support phrases like "third Monday in July"

These kinds of rules are quite common for task and calendar
repetitions.
Write TODO test for faulty order dependence

When combining nth/2 and month/1 rules, the order in which they're
applied affects the results.  This shouldn't happen.  I've made a
failing TODO test to remind me to look at this again.  For now, I've
changed repetition//1 to swap the order so that phrases like "second
Tuesday in July" work as expected.
Implement repetition for "July 1776"
Support "$form during school year"

There are no tests for this form because the phrase "school year" is
different for every jurisdiction.  I need it for my own personal
scheduling, but it won't be useful to others.

This highlights that an English to julian constraints package should
allow users to extend the grammar with additional rules.  We can all
share the universally useful ones and add our own peculiarities on
top.