Improved login form

Added country selector
Added phone number confirmation
Improve welcome page, add confirms
Disabled login autocomplete

Fix #253
Fixed session revoke

Fix #252
Select range of messages

Fix #224
Fixed infinite loading bug
Style improvements, bugfixes
Https mixed content workaround

Fix #237
Fixed welcome background
Fixed https redirect
Fixed confirm message
Login form bugfixes

Fix #258 - Incorrect phone number
Fix #253 - Sms code autocomplete
Performance improvements for scrollables

Fix #257
Fix error modal styles
Improved empty history styles
Clickjacking protection
merge upstream