Ben Kluwe

These two commits add support for building using the cmake build system. The system creates a config file (qpulib_config.h) which defines the preprocessor symbols. The README.md has been updated to...

If you have questions about the [API](http://interactjs.io/api) that aren't answered in the [docs](http://interactjs.io/docs) or [FAQ](http://interactjs.io/docs/faq), try asking in the [Gitter chatroom](https://gitter.im/taye/interact.js) or on [Stackoverflow](https://stackoverflow.com/questions/tagged/interact.js). If you've found something that looks...