Add work-around for Asus Transformer WebView display bug
Make IMAP autoconfig recognize "Draft" as drafts folder

Yahoo names it "Draft" instead of the more common "Drafts".
Set minSdkVersion to 15

Technically, the code still supports SDK 8. But we don't want users to get stuck
on a 4.9xx version when we do remove compatibility with old Android versions.
Merge remote-tracking branch 'upstream/master'
Merge remote-tracking branch 'upstream/master'