v1.1.0

This release is the first incremental release since 1.0. It includes bugfixes and some UX improvements.

Add support for non-numerical UID/GID as specified in the appc spec (#2159). rkt can now start apps as the user and group specified in the image manifest with three different possible formats: a numeric UID/GID, a username and group name referring to the ACI's /etc/passwd and /etc/group, or a file path in the ACI whose owner will determine the UID/GID.
When an application terminates with a non-zero exit status, rkt run should return that exit status (#2198). This is now fixed in the src and host flavors with systemd >= v227 but not yet in the shipped coreos flavor.
Use exit status 2 to report usage errors (#2149).
Add support for tuning pod's network via the CNI tuning plugin (#2140). For example, this allows increasing the size of the listen queue for accepting new TCP connections (net.core.somaxconn) in the rkt pod.
Keep $TERM from the host when entering a pod (#1962). This fixes the command "clear" which previously was not working.

Socket activation was not working if the port on the host is different from the app port as set in the image manifest (#2137).
Fix an authentication failure when fetching images from private repositories in the official Docker registry (#2197).
Set /etc/hostname in kvm pods (#2190).

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