fix "ass" being interpreted as a time

[jonklein]

Well, honestly this issue is immediately top of the list for "Most Amusing Bug of 2016". We were puzzled as to why our app was behaving incorrectly whenever the word "ass" was used in a sentence. We soon found that parsedatetime is treating "ass" as a time:

>>> import parsedatetime
>>> parsedatetime.Calendar().nlp("nice ass")
((datetime.datetime(2016, 8, 10, 20, 5, 35), 2, 5, 8, 'ass'),)

We tracked the issue down to a curious QUNITS regular expression which matches the word "a" as the number 1, the letter "s", and then another "s" for "seconds" (it would also match the word "ash" via the same logic with "hours"). We couldn't quite make sense of the second "s" in the regular expression and believe it should have been "\s" instead - making that change fixes the issue.

This PR also fixes a time-sensitive spec that started failing a couple of days ago.

cc @bgalbraith

---

This change is

[codecov-io]

Current coverage is 76.89% (diff: 100%)

Merging #173 into master will not change coverage

@@             master       #173   diff @@
==========================================
  Files            14         14          
  Lines          1567       1567          
  Methods           0          0          
  Messages          0          0          
  Branches        288        288          
==========================================
  Hits           1205       1205          
  Misses          268        268          
  Partials         94         94          

Powered by Codecov. Last update 91d122d...e45c646

[bear]

Reviewed 3 of 3 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

---

Comments from Reviewable

[bear]

What a hilarious bug!

It took me a couple of minutes scanning the QUNITS regex to even spot the change - wow s \s

thanks for the fixes!