support android xml binary resource

[wjtxyz]

Android compile xml file resource to binary to reduce size and improve performance

GsonXml can add static method, so GsonXml avoid to call XmlPullParser::setInput to prepare the input data

public <T> T fromXml(final XmlPullParser parser, final Class<T> classOfT){
    ................................
}

user can call this method like below code
gsonXml.fromXml(getContext().getResources().getXml(R.xml.config), clazz)

[wjtxyz]

upload to my fork

wjtxyz@7bd3b1d