add recur for other attrs than href

[dupuchba]

• Re-introduce recur as closest is "only" supported by 78% of browsers
• Let recur capture formAction urls on button/input of type submit in order to handle form action for SPAs

[dupuchba]

see #33

[leroix]

This strategy has an issue described in https://github.com/kibu-australia/pushy/issues/27