* checks if babel is installed globally and displays correct cli message - fixes#5228
* recommend local installation and fix lint errors
* uses babel-cli vs babel
* switch back to babel
* use process.cwd() to determine if globally executed
* checks for /node_module/.bin/babel
* compare execPath and module execution path to determine global or local installation
* Move the babel/cli.js into a 'src' so the 'const's are compiled Node < 6.