* Separate registering an account from registering for push notifications
* Allows us to complete registration without prompting user for
notification settings.
UX Changes
----------
* Automatically keep push tokens in sync on startup.
Push tokens *can* change, though they rarely do. It happens more often
for people switching between appstore/beta builds.
fixes#1174
* Show alert with registration failure
* add secret 8-tap debug log gesture to registration flow
* Move registration to separate flow
* don't see flash of inbox when first launching
* show useful error messages when given wrong code / no code
* remove background fetch
We werent using it, but only relying on a side effect of it which is
no longer necessary.
Code Changes
------------
* More registration logging.
* Install PromiseKit with carthage
Our dependencies are not yet framework compatible, so we can't use
cocoapods.
* Merge preferences util "category" into superclass.
The immediate reason for this is Swift interop was assuming optional
types were not optional, and exploding when a value was nil.
This is clearer anyway, since we were treating it like a subclass, and
it was the only thing using the class anyway.
* auto-genstrings now searches *.swift (and *.h, which was previously
broken) for translateable strings.
// FREEBIE
