添加二维数组的支持，将数组的标签统一命名为element
Merge remote-tracking branch 'z/master' into zlz

Conflicts:
	person.xml
	test/unit/com/ztools/xml/XMLTest.java
Merge branch 'zlz' of source.3zso.com:javaprojects/z-xml into zlz
Add Apache License Version 2.0
Merge branch 'zlz' of github.com:zlz3907/z-xml into zlz

Conflicts:
	LICENSE
Merge pull request #3 from zlz3907/zlz

添加数组支持