Update nlcst-to-string to 0.1.0
Add script to generate fixtures
Refactor test

- Refactor spec to be more readable;
- Move spec to new `test` directory;
- Add nlcst-test as a dev-dependency to validate NLCST
  output;
- Move NLCST results from test file to `fixture` directory;
- Add chalk and diff as dependencies, to show differences
  between a fixture and the actual output on errors.
Update .gitignore, .npmignore, bower ignore
Refactor benchmark
Refactor Readme.md
Add NLCST to package keywords
Refactor indent in .jscs.json
Update changelog for 0.2.0-rc.2
0.2.0-rc.2