Annotation Tools Reverting commit @3bfb633 and updating openseadragon.js for latest build

Urgent Fix to merged PR #3969 

Issue: Tried to accomplish an issue raised by @auraz  where I should factor out variables for the annotation tools. Basically ```textannotation_module.py```, ```imageannotation_module.py```, and ```videoannotation_module.py``` each had instances of ```annotation_storage_url```, ```annotation_mode```, etc. I tried to compile them all into ```annotator_mixin.py```. Thought it had worked and pushed the fixes but it turns out that if you go to studio you get the following message anytime I hit "Edit" for image, text and annotation components in studio:
![studio error](http://i.imgur.com/uqQVLlc.png "studio error")

Basically those 4 files got reverted to how they were before commit 3bfb633.

It was made known to us less than an hour ago that the file openseadragon.js we were using was using a different api call then the server so this is a 2-line change to make it work while we upgrade.