0.0.51 release

 - New transaction history UI with search and date ranges
 - QR code scanning in addressbook
 - Fixed currency not being updated in transactions list after change in settings
 - Other minor improvements
iOS: remember language for app restart
0.0.52 Android release

 - Randomised change output index
 - Fixed a bug in sending money to GA* addresses (receiving ids/permanent payment URLs)
 - Fixed a bug in taking funds back from external social transactions
 - Updated translations
Merge branch 'master' of git://github.com/greenaddress/WalletCordova