Cson

- Revert CSON's use of CoffeeScript v2, as it [broke support for Node 4 and below](https://travis-ci.org/bevry/cson/builds/333130290)
- Use of CoffeeScript v2 is now limited to compilation of this project only

- Now uses CoffeeScript v2
- Now uses [editions](https://github.com/bevry/editions) to use the ESNext compiled edition for environments that support it, otherwise use the ES2015 compiled edition
- Updated base files

- `cson2json` and `json2cson` will now output the error if the input file is invalid
- Closes [issue 78](https://github.com/bevry/cson/issues/78)
- Updated base files

- `parseCSString` no longer creates the `sandbox` variable if it was missing, the responsibility of such things should be, and now is, handled via the eval function of coffeescript which is what that method uses
- This is a major breaking change as parsing coffeescript files will now by default run still in a virtual machine but now in the global context rather than their own context
- If you are parsing untrusted coffeescript files, you should now setup the `sandbox` option yourself with the appropriate values
- If you are parsing trusted coffeescript files, or not parsing coffeescript files (e.g. only CSON files), then this change won't impact you
- This change is done such that the result object from `parseCSString` passes `result.__proto__ === Object.prototype` which before it did not as the different context caused the prototype to point to a different contexts `Object` causing the assertion to fail
- Updated dependencies
- Updated internal packing conventions

- Updated dependencies to avoid duplicate CoffeeScript installations

- Fixed stdin support on Node 0.8