First try at passcode UI and views

Basic logic for passcode input, etc
Merge branch 'master' of https://github.com/SpiderOak/SpiderOakMobileClient into issue-347-passcode-ui
More views and flow

(coincidentally, I also found a fix for the odd back-and-forth transition when authenticating a password protected ShareRoom)
Everything except the timeout in the passcode settings screens
onPause and onResume functionality added
touch start for better responsiveness
Unrelated fix for Android 4.4
Add recognition that the menusheet is open, and intervention so that it
just closes, to all tap handlers.

In some cases, there was no 'event.preventDefault()', so I included it
only inside of the intervention, figuring it was otherwise working
without it. It might be that it should have been there, in the first
place, and should be added outside of the condition, but I opted for
minimal change from otherwise working status quo. I'd be happy to revise
this choice, make the change, if so advised.
Take care of several other cases where the menusheet should be
closed, and action inhibited, if the menusheet is open, to avoid
unpleasantly surprising the user.
Toast dialog and exit logic
Merge pull request #383 from SpiderOak/issue-382-toast-dialogs

Toast dialog and exit logic

Fixes #382.
Beginning to implement the passcode screen as auth
Logging out should clear passcode and timeout
Don't keep a passcode if they turn remember me off
Merge pull request #381 from SpiderOak/issue-335-close-menusheet-on-shareroom-tap

Issue 335 close menusheet on shareroom tap
Include instructions for installing the specific core plugins required
for our app.
Better format for core plugin instructions
iOS is sorted, but Android tablets still need some love

Sadly this commit also includes a hopefully temp workaround to the issue of scrolling being broken on android when using zepto 1.0.

I have put Zepto back to RC1 again until this is fixed (and added a `grunt yolo:platform` command to skip the tests until either they are fixed or we are back on Zepto 1.0).
Merge pull request #386 from SpiderOak/core-plugins-instructions

And instructions for core plugins
Update README.md