Changing the way we mattermost handles URLs. team.domain.com becomes domain.com/team.

Renaming team.Name to team.DisplayName and team.Domain to team.Name.
So: team.Name -> url safe name. team.DisplayName -> nice name for users

api/templates/verify_subject.html

@@ -1 +1 @@
-{{define "verify_subject"}}[{{ .Props.TeamName }} {{ .SiteName }}] Email Verification{{end}}
+{{define "verify_subject"}}[{{ .Props.TeamDisplayName }} {{ .SiteName }}] Email Verification{{end}}