Merge pull request #237 from Somesh/master

Permission control enhancement
Merge pull request #238 from Somesh/master

fixexed the bug of wrong sprint calculation when user selects more than ...
Adds base PasswordResetToken datamodel
Adds password reset handler
Fixes required fields, url map and removes debug prints
Fixture to check reset object validity timestamp
Merge pull request #239 from Imaginea/forgot_pwd

Forgot password changes
Superuser API handler for basic stats
Adds Invitation data model and handler changes to create invitation object if user not found
Adds role field to Invitation model
Merge pull request #240 from techiev2/invitation

Invitation flow
added invitaion application to app list
invitaion module