Removed retext from peer-dependencies
Update dependencies

- eslint;
- mocha;
- retext;
- retext-pos;
- retext-visit;
- retext-porter-stemmer.
Refactor spec

Includes changes for for retext@0.2.0.
Remove testling
Update copyright in Readme.md
Fix property order in package.json
Update Installation in docs

- Fix casing of NPM > npm;
- Remove component, which never worked.
Update .gitignore, .npmignore
Remove browser test
Remove `npm update` from travis
Add npm deployment to travis
Refactor API
Refactor benchmark

Includes updates for retext@0.2.0.
Update benchmarks in Readme.md
Refactor Readme.md
Update changelog for 0.1.0
0.1.0