[fix] issue (#12) 初始化偶现崩溃问题#13
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崩溃原因：
loadAllFileToMemory()函数使用的成员变量mRootDirectoryPath为空在 class BitmapFileWatcher 静态代码块中，向线程池提交了执行
loadAllFileToMemory()函数的任务该任务可能会在
mRootDirectoryPath未赋值之前执行，导致发生空指针异常解决方案：
将
loadAllFileToMemory()函数的调用时机，修改到 init() 函数执行以后