Added parallel DirectoryProcessor to walk the file tree in multiple threads
Update README.md
Parallel tree walking class reimplemented, no "Too many open files" exceptions anymore
Merge branch 'parallel' of github.com:ava1ar/DupsFinder into parallel
Merge branch 'master' into parallel

Conflicts:
	README.md
Merge pull request #1 from ava1ar/parallel

Merging parallel branch