Fixed a typo that busted development mode

Updated comments in index.js

Features:

 - State is now properly immutable
 - React dependency factored out into middleware
 - Updated API (thanks, /user/Strobljus!)
 - Now using CommonJS instead of ES6 modules for easier importing

Fixes:
 - Version number in comments / README now auto-filled

Features:

 - Now outputing browserify'd version
 - Exceptions now thrown in development for wrong parameter types
 - Slightly reduced file size

Fixes:
 - ESLint approved
 - Fixed spelling errors in documentation

1.0.1

1.0.0