verify child account
Added user mailer classes
Added some documentation
created event_tag
Fixed usermailer
Merge pull request #100 from yousraHazem/C1_S1_verify_child_account

C1 s1 verify child account
Merged from development
Merged from development again
Merge pull request #84 from yousraHazem/C3_S0_create_event

C3_S0 create event
Issue #58 Resolve Conflict 3