Privly button appears in forms and creates a ZeroBin post

[Updated]
Known issues:
- Twitter forms have a blank div that acts as a button, so clicking it will not trigger the appearance of the Privly button. For it to appear the lower part of the form has to be clicked.
- the button only appears in textareas and editable divs so this means it will appear in Google Translate and any other such contexts witch can be frustrating. But after 3s of not being hovered over it will disappear.