Update dependencies to mobx 3.x, mobx-react 4.x and react-16.x

[nareshbhatia]

• This required taking care of mobx issue #1082.
• Fixed issue #53
• Added a test at the React component level to make sure parameter changes are triggering a reaction. Added Enzyme as a dependency to make this work.
• Updated all other dependencies
• Could not get rollup to work correctly with all the undated dependencies - dropped it. We can add it back later, but in my opinion bundling is not necessary at all. The unbundled ES5 dist is working just fine and the build process is much simpler.

[kitze]

Thanks for the amazing work @nareshbhatia. Merged.