Chore: React 16 compatibility

[dotcs]

In this PR I have updated some code parts, that broke with React 16.

These are the things I fixed in this PR:

• Added typings to package.json (otherwise TypeScript typings are not recognised in consumer)
• Fixed prepublishOnly npm script
• Added build npm script
• Added react@^16.0.0 to peer dependencies
• Added prop-types package, because PropTypes have been removed in React 16
• Added react and react-dom to dev dependencies, because otherwise tests won't work
• Use ref instead of ReactDOM.findDOMNode, because the latter should be avoided and does not work properly in React 16
• Add yarn.lock file
• Fix issue in tslint config which lead to disallow imports from react-dom/server

If you want to test the current version with React 16, then you can use @dotcs/[email protected]. I have uploaded the fixed package to this npm repository.

[coveralls]

Coverage increased (+0.03%) to 97.51% when pulling 3dfb879 on dotcs:chore/react-16-compat into 8d76d67 on Josh-ES:master.