(Partially) unbreak the test system

Our tests still fail, but now at least
we have all the stub files where we want
them, and we are at least attempting
to run most of the tests.
Merge pull request #94 from hypothesis/unbreak-test-system

(Partially) unbreak the test system
Add a missing newline
Deleted some tests that broke the test system itself
Re-enable the (broken) annotator tests
Merge pull request #95 from hypothesis/unbreak-test-system

Unbreak test system 2
PDF: add utilities for PDF.js version-based decisions
PDF plugin: user marker classes depending on PDF.js version

See the inline comments in the code.
Stop using the classList API
PDF.js version tests: add tests