Bump version to 0.2.0
Bump version to 0.2.0

Remove harmless webpack error by keeping react <15.4 in this
version. As a result, the DOM property configs will be required
from `react/lib/`.

Chore:
- Tidy package.json
- Create npm script `clean` and update scripts
- Update README installation instructions
- Fix Travis tests

remarkablemark/html-react-parser,remarkablemark/html-react-parser,remarkablemark/html-react-parser