Moved out environments and examples out of main Fission repo to their own repo. This is to allow changes to environment releases to be independent of main Fission releases.
Upgrades the node environment to NodeJS 7.6.0. Functions can now use async/await and promises; they can return a promise instead of using a callback. The change preserves compatibility with the callback style.
* Upgrade node environment to Node.js 7.6.0+
* Bump package version
* Preserve compatibility for callbacks
* Cleanup
* Re-add hello callback example
* Make sure not returning won't blow everything up
* Update stock example with request promise
