Remove support for methods with underscore names

[fmcarvalho]

In current API route parameters must be part of both method's name and method's arguments list.

However this incurs on additional issue whenever the user has a mistake and puts a non matching name between arguments and method's name. In this case the connect-controller cannot detect if it is a typo or a deliberate intention of considering that argument as no route parameter, but instead a query-string.

So, to avoid this scenario we should follow the express convention for route paths definition and the user must define the property name as a string, to allow the use of / and : symbols. For simpler cases, without route parameters the user may still use the lower camel name corresponding to the route path.

Finally, remove support for methods defined with underscores.