Add targetEls Option that Configures Specific input Elements for Update

[michaelahlers]

Sorry about the duplicate issue. This is work for issue 198.

Adds targetEls configuration option that can either be an element selector string or jQuery object. Added getTargetEls function to the prototype that returns based on the presence of a truthy jquery value on options.targetEls. Defaults to input so behavior is unchanged.

I haven't written unit tests due to issue 200 (an issue with the Bootstrap submodule).