Feature/wallet creation

This PR contains:

* Intermediate screen at wallet creation (waiting for complete ring of copayers) (Fixes #704)
* Improve tooltip styles. (green color used in other places) (Fixes #670)
* Fix layout for small devices. (font and column sizes). mobile.css is a new separate file used for mobile definitions.
* Fix size of comment input for medium devices.
* Fix layout in backup page.
* Fix typo (my previous PR)
* Simple test for: getNumer (it converts a number in an array of undefined elements).

This should really be wrapped inside of another describe that says describe('#getNumber', ... If we can keep tests for each function in their on describe, it is easier to see which functions have tests and which don't.