BugFix: Fixes issue with route nesting with group operator

Merge pull request #30 from jvverde/master

Fix a bug I found when there are more than one group (at same nesting level) under a non null prefix path

v0.6.1 - Enable function type as a possible middleware handler type

• In addition to restify middleware type, support a generic function type to support doing uploads for example.

v0.6.0

• Supports a new syntax for inline nesting of routers via .group