Expose regex pattern

[testn]

It would be nice to expose the pattern that URI template used internally so that developers can use it to perform the URI matching as well as extracting parameter from the template without relying on URI template afterwards.

[damnhandy]

Can't do that, mainly because this library doesn't use RegEx to parse the URI template string, so there is nothing to expose. However, this feature is being worked on as part issue #2