Bug-96 travis.bat and wait_for_emulator.bat

@john-hu I have finished this one. But now, I still have to manual clean project again after I run it. Even I add `ant clean` to the batch file.
One more suggestion: it is nice to have this kind of file. But it may create an AVD named with "test". This may not be wanted by normal users. So, we may just assume that they had created the AVD and run the travis.bat.