Update dependencies

- Update franc, retext, retext-visit, retext-content;
- Remove retext from peer-dependencies.
Refactor spec
Remove testling
Fix property order in component.json, package.json, bower.json
Update .gitignore, .npmignore
Remove browser test
Refactor API
Refactor Readme.md
Update changelog for 0.1.2
0.1.2