toJSON, get methods simplify, README, examples etc

- Cleaning up toJSON responses (parentDoc/kind attrs)
- Annotation Collection initialize saving
- parseText integrated into init
- Fixed position for Github flag
- Fixed position credits flag
- MIT License update w/ contact info
- Updated README w/ demo gif, explanation of project goals, roadmap, code examples and callback examples
- demo.js to better follow README
- Annotation no longer need getText|Start methods after preventing annotations w/ 0 words