Use team display name in team switcher menu

- /teams/find_teams returns team objects instead of just team names
- use display_name in UI instead of name in the team switch menu

model/client.go

@@ -185,7 +185,7 @@ func (c *Client) FindTeams(email string) (*Result, *AppError) {
 	} else {
 
 		return &Result{r.Header.Get(HEADER_REQUEST_ID),
-			r.Header.Get(HEADER_ETAG_SERVER), ArrayFromJson(r.Body)}, nil
+			r.Header.Get(HEADER_ETAG_SERVER), TeamMapFromJson(r.Body)}, nil
 	}
 }