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After pushing Add tag modal window appears (same modal window as in Altassian):
Annotations:
Annotating text:
When user selects text, then appears little black div button Annotate.
User pushes it, then appears Annotation view where user can add info about annotation. Just same annotation block but with text input.
Annotation view:
Also there is a button (Annotations on the right side). After clicking it, appears list of annotations related to this slide.
For each annotation in this list, we have remove button and button for changing url (for expert users) (not sure if need this feature, but just in case)
