Blob: Auto-calculate length when Blob is being detached with binary data or not.
Env: Detect Android Browser and Dolphin (both have the same user-agent string for some reason).
FormData: Add convenient method to retrieve Blob name directly without extra looping over all FormData fields.
XHR, HTML5: Add workaround for Gecko 2/5/6 and Android browsers, that are unable to properly send blobs in FormData.