[Systems] added .xo mime types to apache in sunjammer

[Tomeu Vizoso]

Hi,

just added the mime types for xo bundles as per

http://wiki.laptop.org/go/Content_bundles#Bundle_hosting

This was needed because IE and Safari were downloading the bundles as
.zip and afterwards not working in Sugar without renaming, that is
made difficult in recent versions of Windows.

Regards,

Tomeu

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