fix(input): Throw errors if not exactly one input matching

[pixelastic]

Fixes #74

[algobot]

By analyzing the blame information on this pull request, we identified @bobylito, @redox and @vvo to be potential reviewers

[redox]

I think we should rather rely on the latest (not deployed yet) version of autocomplete.js to handle multiple search bars. Not throwing anything to keep it jquery-style: $('.whatever').show().hide().doesntthrow()

[pixelastic]

@redox: Is the new version you're talking about now deployed?

I did not get the $('.whatever').show().hide().doesntthrow() part

[redox]

About to release it.

[redox]

By upgrading to autocomplete.js=0.17.2 we're now able to bind the dropdown menu to several inputs, like it was already for jquery. Closing this PR.