Version check: errorformat depends on the combination of node version
and CoffeeScript version. When run under recent nodes, only 1.6.2 and
newer produce errors we know how to parse.
Changed again "-t", this time to "-cp".
The -t flag will output tokens (and syntax errors if there are any) - it is quite a lot quicker than another alternative, -n, especially for large files.
No need to generate a file when linting, as the coffeescript compiler
will do that for you.
This has been tested with coffeescript 1.6.2.
Also: use options over flags for readibility
