Update Zooming Image tool documentation
Update zooming image tool info and add image
Merge pull request #2242 from edx/sylvia/documentation/BLD-630

Sylvia/documentation/bld 630
annotation tools
First set of fixes from the pull request

This does not include some of the testing files. The textannotation and
videoannotation test files are not ready. waiting for an answer on the
issue.
Deleted token line in api.py and added test for token generator
Added notes_spec.coffee
remove spec file
fixed minor error with the test
fixes some quality errors
fixed unit test
fixed unit test