closes#5358
- Moved node version check and exits if not supported
- Removed upgrade warning from `ghost-server.js`
- Perform a check for NODE_ENV, uses `config.example.js` if none apparent
- Updated all dev dependencies in the root package.json
- Added `--colors` to mocha when called from grunt test:... so that works better
- Removed non-unit tests from coverage, because they're just not useful
- Updated docker config to generate useful docs again - as a statement of intent, I also updated docs in key files
- Setup grunt watch-docs task for documentation writing easyness
issue #5259
- removes the colors dependency
- adds in chalk dependency, and migrates everything to use that
- reduces some specs now that the log calls are cleaner
