No underscore in main library
No underscore in nlp
No underscore dependency in package.json
No underscore dependency in bower.json
No underscore in tests
No underscore in demo
No underscore in README
Drop polyfills
Merge pull request #48 from gsf/no-underscore

Removed dependency on Underscore.js

Support for IE 8 and older has been dropped (it can be added manually by providing ES5 Array method polyfills).