Incorrect return type in some overloads of ResolutionExtensions.CanResolve

[robv8r]

In Ninject.Syntax.ResolutionExtensions, some overloads of the CanResolve method incorrectly return an object. These should return a bool since they all call the same private CanResolve method which returns a bool.

Also, the documentation for these methods all state that the return type (whether object or bool) is "An instance of the service." This should be "<c>True</c> if the request can be resolved; otherwise, <c>c>false<c>/c>."