fix #1332 remove ptr tip

fix #1332 remove ptr tip.

After reading a lot of comments:

* some of our users love PTR
* some of our users hate PTR and want the refresh button back
* some of our users don't know how to dismiss the tip
* some of our users don't know they can PTR (tip dismissed and they probably forget about it)

Note: we originally added the PTR action + Progress Bar to remove the graphical refresh button (and the mess the rotation animation was inducing).

This PR adds a text only "Refresh" button in the overflow menus of all concerned views (like gmail and google+ apps). When this button is pressed 1, 5, 10, 20, 40, 80 (now for fun: 160, 320, 640), a Toast message with the tip appears. That should please all users listed above, excepted those who really want the graphical refresh button.