Fix download button waiting if document has started but not completed downloading
Added CSS rules to allow smooth (momentum) scrolling on iOS devices
Rewrite 'Preferences' to make it async
Modify {get, set}Preferences in PdfStreamConverter.jsm to support async
 Add preference to automatically enable the Hand Tool when the viewer loads
Merge pull request #4482 from Snuffleupagus/prefs-async-v2

Rewrite 'Preferences' to make it async
Merge pull request #4516 from dferer/ios-scrolling

Added CSS rules to improve scrolling on iOS devices
Merge pull request #4455 from aib/master

Fix download button waiting if document has started but not completed downloading
Sync l10n files
Refactors history and how the database is stored
Merge pull request #4559 from yurydelendik/history

Refactors history and how the database is stored
Remove unused variable
Make Opera a possible browser to test with
Merge pull request #4563 from bthorben/testWithOpera

Test with opera