fix(urlMatcherFactory): Slashes are now properly decoded in url params

[ckniffen]

Fixes: #1973, #1645

[piotrd]

👍 tested with a large app, works great. Can anyone merge it, please?

[ckniffen]

@piotrd have you checked #2071? I think it is a better implementation.

[piotrd]

@ckniffen: you're right. Thanks for pointing this one out, I somehow didn't notice that PR. I tested it now and unfortunately it fails for val being null. I made a comment in the PR about it, along with proposed improvement (https://github.com/angular-ui/ui-router/pull/2071/files#r33758421).

@ckniffen, btw, both PRs leave me with %252F in the address bar after navigating. I'm wondering if there's a way to avoid that and keep the original slash there. Or maybe it's a matter of my code. Will investigate further for sure.

[ckniffen]

Closing in favor of #2071.

@piotrd I get that too. I could not find a way around it though.