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

web/react/utils/constants.jsx

@@ -54,7 +54,7 @@ module.exports = {
   DEFAULT_CHANNEL: 'town-square',
   OFFTOPIC_CHANNEL: 'off-topic',
   POST_CHUNK_SIZE: 60,
-  RESERVED_DOMAINS: [
+  RESERVED_TEAM_NAMES: [
     "www",
     "web",
     "admin",