Any and Match methods

Added any() and match() methods. Read how use them here: https://github.com/fremail/lumen-nested-route-groups#any-and-match-methods

If you use one of previous versions of this lib, you can safely update it to v1.1.0 without any changes.

NestedRouteGroups config namespaces merging

Now this lib have its own config to determine what namespaces would you use: nested (Laravel style) or full (Lumen style).
The lib is still work without config (by default it uses nested namespaces), so if you have it in your project you can update it with no fear.
Steps how to use full namespaces instead of nested you can find in readme.

v1.0.1-beta

Fixed error in middleware stack if it's empty (see pull request #2)

v1.0.0-beta

Let's start the beta testing. I think this lib is rather stable, but don't sure in that yet.