Merge pull request #2 from acron0/logging

Added minimalist logging framework
Added middleware framework
Middleware is no longer a static class and resides within the crow object - much cleaner
Added macro CROW_MIDDLEWARE_USE for specifying IMiddlewareHandler types
Merge branch 'middleware' of github.com:acron0/crow into middleware

Rebasing
Updated example for contrib changes
Merge branch 'dev' of github.com:acron0/crow into dev

Rebasing