Add start tag state tokenizer unittests.
Remove \t case in start tag tokenizer.

This case is already handled in the first if statement of
the webvtt_start_tag_tokenizer() function.
Add annotation state tokenizer tests.
Add end tag state tokenizer tests.
Add time stamp tokenizer tests.
Add newline to end of files.
Merge pull request #358 from RickEyre/tokenizer-tests-2

More cue text tokenizer unit tests.