This PR attempts to fix the issue where the Grey Dots (indicating previous Text Annotations) wouldn't appear when loading a Subject, and Blue Dots (indicating new Text Annotations) wouldn't appear on mouse clicks/user input.
The fix is similar to zooniverse/shakespeares_world/317
Testing
When adding a new Text Annotation, we expect to see a dot on the first mouse click, then a second dot on the concluding mouse click, indicating the start/end of a line.
When viewing Subjects with previous Text Annotations, we expect to see Grey Dots in various places, where previous users have submitted transcriptions.
Tested OK on OSX+Chrome54/FF49/Safari9
Not tested on IE11 - there are known issues with IE11
Status
Merging so Chrome/FF/Safari users will be happy; will address IE11 issues (if any) later.
Fix #202