validation: Fixup a few email address validations
orgs: Add UI support to configure contacts and collaboration
orgs: Auto import based on email domain
orgs: Auto assign tickets to account manager
orgs: Auto add collaborators to new tickets
orgs: Add alerts for account manager
Always notify managers on new ticket
Fixup merging of email recipients

This stems from a confusing similarity between the + operator for arrays
and array_merge() in php. Adding arrays will ignore items in the RHS where
keys are present in the LHS. Therefore, when adding numerically indexed
arrays together, only items on the RHS that have a key higher than the
greatest key on the LHS will be included.
Fixup tab navigation with multiple tab sets
Merge pull request #776 from greezybacon/feature/organization-contacts

Add contacts to organization

Reviewed-By: Peter Rotich <peter@osticket.com>