[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
[WO-498] Add newsletter signup
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
Merge pull request #104 from whiteout-io/dev/WO-498

[WO-498] Add newsletter signup
Update README.md
Update README.md
Fix reader on empty body
Merge branch 'master' of github.com:whiteout-io/mail-html5
Fix reader
[WO-530] fix typo