files that have been uploaded via ci should not have to be re-uploaded if the command was interrupted

[GoogleCodeExporter]

What steps will reproduce the problem?
1. Change files
2. Start pushing them via ci
3. Interrupt the connection
4. Start pushing changes via ci again

What is the expected output? What do you see instead?
I'd expect files that were uploaded before to be already present in the 
repository. Instead, they're re-uploaded, which might take a lot of time for 
bigger files and/or large collections of files.

Original issue reported on code.google.com by jannis.u...@stoppe.de on 2 Oct 2013 at 6:43

[GoogleCodeExporter]

Yes, this would be highly useful.

Original comment by ekb...@gmail.com on 3 Oct 2013 at 7:35

• Changed state: Accepted
• Added labels: Type-Enhancement
• Removed labels: Type-Defect