Update typings installation instructions. (#317)
Update typings installation instructions. (#317)

* Update typings installation instructions.

* Distinguish between flags for older version of typings (still used by angular-cli).

angular/angularfire,maneesht/angularfire2,angular/angularfire,angular/angularfire,maneesht/angularfire2,maneesht/angularfire2,maneesht/angularfire2,angular/angularfire