* Remove unsupported Node versions 0.10 and 0.12 from CI
* Replace deprecated Buffer constructor with .from/.alloc
* Remove Promise polyfill
* Make use of Object.assign
* Remove checks for versions of Node earlier than 4
* Remove Buffer#indexOf fallback for Node 0.10
* Initial work on removing internal pool
* Port backwards-compabible properties
* Cleanup test execution & makefile cruft
* Attempt to fix flakey error test