Added several quote tests.

Added several quote tests.

* Added tests by different quote sequence signatures -- primarily
  to stress parsoid in different situations and figure out/document
  where Parsoid needs to conform with PHP parser output and where
  it is acceptable to diverge.
* Some of these tests can likely be purged since they don't test
  anything beyond what is already tested elsewhere, but I haven't
  investigated that yet.  But, there is probably no harm in a few
  duplicated tests.

Change-Id: Id2c7b3ea4dac5f9e8f9b042b439061bf9faea9f2