Add source/destination parameters

[darek]

Would be great to have source/destination parameters instead of what now looks "files" parameters

Now I can't use variables (error: can't use interpolations here) in destination path to look like: files: { "#{TARGET_DIR}/style/app.css" : ["#{STAGE_APPDIR}/*/_.styl"] }

we could use something like

files: { src: ["#{STAGE_APPDIR}/*/_.styl"] dest: "#{TARGET_DIR}/style/app.css" }

[sindresorhus]

You can use whatever grunt supports. The readme example is just that, just an example.