problemset model
Merge remote-tracking branch 'upstream/master'

Conflicts:
	web/handlers/user.py
add decorator
o
add get_problemsets
add get_problemsets
Merge branch 'master' of https://github.com/roba269/gf2
Merge pull request #25 from niczy/master

Add python gf2.py deploy --instance=local to start the local server.
Add UserManager, store user info in local storage.
Dual language
some updates
mv lib to gf2lib
add some messages
Re-arrange libs
Merge pull request #27 from charliezhang/master

Add UserManager for user info. en/ch Support
address comments
Merge pull request #22 from roba269/master

Add get_problemsets api and some other util functions
Update build.
Merge branch 'master' of github.com:gf2/gf2
Fix build.