[WO-510] fix toBigInteger bug
* Add tests to reconstruct the issue
* Upgrade to OpenPGP.js v0.7.2
bump versionCode
[WO-524] Cleanup login ui
* Make design more mobile friendly
* Make label for terms agreement clickable (easier for touch)
* Button width is 100% for mobile
* Let user import key file as alternative to sync
* Make key import option more clear login-initial
* Make whiteout logo smaller in mobile mode
[WO-462] Rework login workflow
* Make keygen and import possibilities clearer in login-initial
* Show spinner when generating key
* Use mobile design (wide buttons) everywhere
* Show info about key-sync in login-new-device (for mobile users)
* remove info popovers in login screens
* allow keyfile import even when keysync has been activated
Increase margin after terms checkbox
Make TLS checkboxe labels clickable
Fix bug where changing passphrase back to empty string blocked keygen
Use SVG travis badge
[WO-475] give backbutton on android sane behavior
Set back button event in navigation.js
Merge pull request #101 from whiteout-io/dev/WO-475

[WO-475] give backbutton on android sane behavior
Fix back button tests
WIP: start making whole reader scrollable