[sugar] status of MANIFEST file

[Christoph Derndorfer]

Hey all,

Daniel and me are again having another weekend-jam working on the 
activity handbook and we've just spent the past half hour looking at 
different .xo packages from the git-repository to see how the MANIFEST 
file inside the .xo package is being used.

Results really vary, some activities don't come with a MANIFEST at all, 
some only list a file or two inside the MANIFEST while others really do 
come with a complete index of all the files included in the package.

So what I'm basically asking is what the exact requirements for the 
MANIFEST file are as activities seem to work regardless of what it contains.

Thanks,
Christoph