Merge pull request #1 from stchang/master

fix laziness bug in implicit queue and deque
Start to port pfds to Planet 2
More adjustment for Planet 2
More work on PLaneT 2 compat
Start some doc cleanup
Some small doc fixes
Fix docs to remove build warnings
Add git attributes file
Normalize line endings
Add Planet 2 metadata
Use racket `xor` instead

(still broken though)
Remove broken set implementation
Remove unnecessary #:optimize
Fix reliance on broken type variable scope
Resolve collection inconsistencies.

- move the scribblings so that they build again
- minor fixes to the scribblings build
- update module references in README
Add queues to README.
Move files to pfds collection
Put back an info file for Planet 2
Update README
remove dup provides in stream