Revert "Hack around for iOS to support old extension"

This reverts commit c3379f98f01fa865151c51e57ea0d2b58df448af.
Revert "Fix #539 - Detach video tag before modifying it"

This reverts commit fd5b10e36ec93fe35364e737c6c15295b1598ca2.
Fix #575 - CSS hack instead of detach
Merge pull request #593 from flowplayer/bug/575

Hide video.fp-engine when player is in loading state