Extends input files fuctionality.

Allows useing of: files: 
[{
expand: true,
flatten: false,
ext: '.json',
cwd: 'workingDir',
src: ['./sources/**/*.hson'],
dest: 'destDir'
}]
Update README.md
Update README.md
Merge pull request #1 from lachvoj/master

Extends input files fuctionality. Thanks, lackvoj