Added phased initialization of javabean cartridge

Make it possible to execute multiple methods with the @Initialize tag in phases.

The @Initialize tag will need something like a optional attribute called phase. This attribute gets a phase number, defaulting to 0. When Smooks initializes the visitors it will first call the intialize method with the 0 phase number. When they are all called Smooks will call all the initialize methods with the 1 phase number. It will continue calling these methods until no @Initialize methods in the phase are found.