Remove convenience configuration methods

Per this thread:

http://www.mail-archive.com/shiro-dev@incubator.apache.org/msg00525.html

Convenience 'pass through' setter methods will be removed, as they add complexity, verbosity and are awkward to maintain. Clean configuration can still be done in a number of ways, especially via property path expressions in .ini:

securityManager.authenticator.authenticationStrategy = $myAuthenticationStrategy

or via a Builder or in Spring environments, possibly a SecurityManagerFactoryBean or similar.