Add option to log into file

[petrovskyy]

It would be great to have an option to log into file not only console.
Similar option exists in "jshint" and is called reporter. It also has checkstyle option.

Thanks in advance.

[nwhite89]

+1

[danielppereira]

+1

i think it's more a report then a log, but it's ok. It's the same idea.
JShint Example:

options: {
    jshintrc: true,
    reporter: 'checkstyle',
    reporterOutput: 'jshint/report/jshint.html'
}