[ios] Cleanup extra semicolons
[ios] Cast id references to NSURL to avoid compiler warnings (Fixes: apache/cordova-plugin-file-transfer#18)
[CB-5175] CDVFileTransfer asynchronous download (Fixes #24)

Since download can take time, for it to be non-blocking, moved the call to a separate thread.
iOS: Fix error where files were not removed on abort
CB-6422 [windows8] use cordova/exec/proxy
CB-6460: Update license headers
CB-6452 Updated version and RELEASENOTES.md for release 0.4.3
CB-6452 Incremented plugin version on dev branch.
CB-6494 android: Fix upload of KitKat content URIs

FileTransfer was double-decoding the source URL.