Update downloadFile.java

I just copy pasted the google example for downloadFile
Merge branch 'master' of https://github.com/Nate711/hackathon-encrypted-drive

Conflicts:
	downloadFile.java
Made downloadfile.py

Same as google code.
Made listfiles.py

It's copied from
https://developers.google.com/drive/v2/reference/files/list#try-it
Merge branch 'master' of https://github.com/Nate711/hackathon-encrypted-drive