Apache FreeMarker {2.3.24-stabilization}适配Android

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修改如下：
    1、用openbeans代替java.beans.*
    2、自己实现TreeNode接口代替javax.swing.tree.TreeNode

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编译好的jar文件在“jar包下载”文件夹中。

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Apache FreeMarker原Git地址：https://git-wip-us.apache.org/repos/asf/incubator-freemarker.git
Openbeans Git地址：https://git.oschina.net/jidebingfeng/openbeans.git