v2.0.0-alpha.3

Additions

• Add $delete flag for relational items (#114)
• Add referral URL in SSO request_token (#127)

Changes

• Renamed rollback to revert (#110)
• Move server info to / (#88)
• Save rollback as ROLLBACK activity instead of UPDATE (#109)
• Return 400 error for wrong parameters (#81, #92)
• Fixed file endpoints (#67)
• Fixed bug where SSO login would search for non-existing group column (#128)