Merge pull request #42 from microamp/master

second and ffirst shortcuts, thanks to @microamp
Merge /home/microamp/devel/projs/github/fn.py
Merge pull request #43 from microamp/master

Implement iters.iterate, thanks to @microamp
Very basic implementation for finger tree (no measurements, no splitting, no concatenation)
Merge branch 'master' of github.com:kachayev/fn.py
Implement Deque based on FingerTree data structure
Update README file with basic information about deque usage
Merge /home/microamp/devel/projs/github/fn.py
Implement iters.every and iters.some