Fixed #19 and improved work with multiple files

[afitiskin]

Now we can use one task for multiple css file, for example:

dist: {
  cwd: 'app/assets/styles',
  src: [ "*.css" ],
  dest: "dist/assets/styles/",
}

All css files from app/assets/styles will processed and saved to dist/assets/styles directory.

PS. Sorry for my bad english, I'm non-native speaker, feel free to correct me :)

[ehynds]

Hey, thanks for this. Can you add unit tests?

[afitiskin]

Of course, but I did not found any tests for grunt task. 95% of my changes is in grunt-image-embed.js, but there are no test cases for this files in test directory. May you help me to add the test cases?

[wclr]

why not merged?