Master

Added state restoration support. Thanks to @zhongwuzw for the great work on this - #18
Fixed Unity 3D docset bug which caused it to not remember the selected language. Thanks to @hantengx for reporting the issue - #17
Fixed a crash in the docset downloader. Thanks to @zhongwuzw for the fix - #16
Stopped an evil if from taking over the world. Thanks to @BalestraPatrick for reporting the issue and @flovilmart for fixing it - #4