By default, the polymerization Maven project management, subproject can completely inherit all API JAR package and the parent project
but we can also look at the parent class project marked, not sub-modules inherit, if the sub-module which want to inherit several, such tags can be used
in which version this place in the sub-module, without writing
sub-modules are not written version number.
Parent module to modify the version number, after sub-module refresh also dynamically update the
benefits of a professional to do is, the parent module can generally manage all JAR package sub-module,
because we have a lot of time, different sub-modules require different JAR, there is no necessity let each child inherits the parent class of all modules all the JAR package.
