auth/user: add quota attribute

Related to #626.
api/auth: starting to change the quota usage

Related to #626.
auth: use constant for unlimited quota
api/auth: do not delete quota when deleting the user

Related to #626.
docs/install/client: remove Go 1.2 note

Go 1.2 is out there.
api: delete quota handlers

Related to #626.
api/auth: remove dead test

Related to #626.
api, auth, quota: add Quota type

It will be easier to manage.

Related to #626.
auth/quota: add function to reserve the use of an app in user quota

Related to #626.
auth/quota: implement ReleaseApp to deallocate quota

Related to #626.
app/test: create test user with unlimited quota

Related to #626.
app/actions: change reserveUserApp to use the new quota schema

Related to #626.
api: update test for user quota

Related to #626.