Merge pull request moby#2103 from tianon/clean-out-fixme

Clean out a few outdated FIXME items

FIXME

@@ -15,23 +15,16 @@ to put them - so we put them here :)
 * Run linter on codebase
 * Unify build commands and regular commands
 * Move source code into src/ subdir for clarity
-* Clean up the Makefile, it's a mess
 * docker build: on non-existent local path for ADD, don't show full absolute path on the host
-* mount into /dockerinit rather than /sbin/init
 * docker tag foo REPO:TAG
 * use size header for progress bar in pull
 * Clean up context upload in build!!!
 * Parallel pull
-* Ensure /proc/sys/net/ipv4/ip_forward is 1
-* Force DNS to public!
 * Always generate a resolv.conf per container, to avoid changing resolv.conf under thne container's feet
-* Save metadata with import/export
+* Save metadata with import/export (#1974)
 * Upgrade dockerd without stopping containers
-* bring back git revision info, looks like it was lost
-* Simple command to remove all untagged images
+* Simple command to remove all untagged images (`docker rmi $(docker images | awk '/^<none>/ { print $3 }')`)
 * Simple command to clean up containers for disk space
-* Caching after an ADD
-* entry point config
-* bring back git revision info, looks like it was lost
+* Caching after an ADD (#880)
 * Clean up the ProgressReader api, it's a PITA to use
 * Use netlink instead of iproute2/iptables (#925)