Handle param middleware errors

[kronicker]

This PR aims to resolve #8

• Common wrap function is added with function parity preservation to enable acceptance of an arbitrary number of params in wrapped middleware functions. This is possible cause of the fact that next is always the last argument. The only exception is .param middleware which is pinpointed by the only one having 5 arguments (req, res, next, paramValue, paramName).
• Router.prototype.constructor.param method is patched and middleware function is wrapped to catch errors
• Test for .param error handling is added

[davidbanham]

Thanks for the PR, @kronicker ! Just wanted to drop a quick note to say I've seen this. I'll hopefully have time to review over the next couple of days and I'll get back to you asap.

[davidbanham]

Merged and released as 3.1.0. Many thanks!