Add root directory for ftp server. Fix some bugs on huawei p6. #23
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1、增加了ftp server功能对root目录支持,这样用户可以方便地通过ftp访问外置sd卡上的内容。
2、修改了在huawei P6上运行时的部分bug,在华为P6, Util.getSdDirectory() 返回 "/storage/emulated/0", 而primary folder 是 "/mnt/sdcard", 但他们是同一个目录,造成原代码中判断错误。