fix bug: removeListener sometimes not working#138
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removeListener not working in some scenior:
If the element or its parent has already been removed and appended to the DOM again
then Object.onload is been called again, and onElementDetectable will be called again
in some scenarios: users want to removeListener before element been removed
but when the element been appended to the DOM again, if onElementDetectable is called
then addListener function will be called again