5 new tests (3 Parsoid serializer, 2 parser) & fixed 4 tests.

* Updated html output of two parsoid-centric tests to reflect
  changes in parsoid output.
* Updated 'disabled parsoid' options on two tests to 'parsoid'.
* Added three more tests for the Parsoid serializer.
* Added two tests documenting differences in PHP and Parsoid
  output for overlapping HTML tags (sometimes seen on wikipedia
  pages).

Change-Id: Id72fc5de5a09490028b64a522db3461970008960
Merge "5 new tests (3 Parsoid serializer, 2 parser) & fixed 4 tests."