Bump path-to-regexp dependency to 0.2.x
Assert that route path must be a String

This validates the route path input to make sure it's a String, or an Array with a String as the first item.

The path-to-regexp lib supports String, RegExp, or an Array of either as its input for `path`. The idea here is to make this package have a similar signature, but this package will throw when it encounters a RegExp route because it cannot produce a deterministic string from it.
Add support for unnamed and custom match params

This adds support for the unnamed and custom match params features of path-to-regexp. It will also validate that the generated path will in fact match the original route, and throw if it doesn't.
Update contributors in package.json
Replace falsy checks with safer `undefined` checks

Also add test with `0` value.
Fix typo in test
Merge pull request #2 from ericf/path-to-regexp-0.2.x

Implement all path-to-regexp features