hack/PACKAGERS.md: libdevmapper
Factor cache-probing logic out of buildfile.commit() and CmdRun().
Record added-tree sha256 in buildfile.CmdAdd, probe and use cache.
Add testcases for ADD caching, closes #880.
Add self to AUTHORS.
Add CHANGELOG.md entry for ADD caching.
Add -S option to tar for efficient sparse file handling

Fixes issue #3282
make a more complete example of docker run, showing the use of most of the options (Closes #1500)
Return error if Dockerfile is empty
Add arch/os info to user agent (Registry)
Add dynamic os/arch detection to Images
Allow mtu to be configured at daemon start
Only parse upto the mountpoint in mountinfo
Merge pull request #3294 from discordianfish/3293-better-error-dockerfile-empty

Return error if Dockerfile is empty
Merge pull request #3291 from dineshs-altiscale/3282-sparse-files

Add -S option to tar for efficient sparse file handling
Merge pull request #3300 from crosbymichael/fix-mountinfo-parsing

Only parse upto the mountpoint in mountinfo
Merge pull request #3289 from crosbymichael/add-mtu-option

Allow mtu to be configured at daemon start
add TestContainerOrphaning integration test
Added a note about a networking work around.

An additional flag to limit the networking MTU is required in three Compute Engine zones for reliable networking from inside the docker container. Added a warning to that effect to the QuickStart guide.
Update MTU work-around to use the new -mtu flag