ensure mount in commit
add regression test + go fmt
Refactor checksum
Handle extra-paremeter within checksum calculations
Refactor the image size storage
Remove unused parameter
Switch json/payload order
Make sure the index also receives the checksums
Merge pull request #1291 from dotcloud/ensure_mount_commit

*Builder: Allow the commit of a non-started container
Merge pull request #1268 from dotcloud/refactor_checksum

Refactor checksum
fix tests about refactor checksums
Merge pull request #1344 from dotcloud/refactor_checksum_tests

fix tests about refactor checksums
rebase master