Add sort function.

Evan did 95% of the work, but forgot about the F2 wrapper.
Add sortBy function.
Use Utils.cmp for sorting
Add sortWith
Add initial CONTRIBUTING.md
Fix Keyboard.lastPressed to signal repeated keys
Add Library for Lazy Evaluation
Add more Stream functions
Merge pull request #355 from mgold/sort

Add sorting (targeting dev)
Add examples of new sorting functions and fix the typo mentioned in #355
Split Streams into separate module and add apply (a la <*>)
Add some basic functions to Lazy library
Add more Stream functions and start documentation
Lazy/Stream API changes
Update Lazy docs
Add Stream docs and fix type of sampleOn.
Merge pull request #378 from maxsnew/lazy

Add Lazy Evaluation/Streams Library
Add notes about sorting and laziness
Increase sharing in Stream combinators
Fix iterate with optimal sharing