Updated Introduction link

Previously the introduction link pointed to www.docker.io. That
did not seem to make a lot of sense to me so instead I pointed it
at:

http://www.docker.io/learn_more/
Reimplement lxc-ps

Instead of calling lxc-ps in top endpoint, we reimplement it by
calling ps and filter for pids running in a given container.
Fix and re-enable TestGetContainersTop
Added warning when browsing master. & no longer hides alternative versions.
Fix "go tool cover" detection to only add -cover and -coverprofile if we both have cover support in Go, and if we have the cover tool downloaded
Purge more hack references to Go 1.1.2 (since it requires backported archive/tar patches now, and Go 1.2 is _widely_ packaged successfully)
update fedora doc: docker and docker-io conflict

Signed-off-by: Lokesh Mandvekar <lsm5@redhat.com>
docker and docker-io conflict update for epel

Signed-off-by: Lokesh Mandvekar <lsm5@redhat.com>
Merge pull request #3168 from discordianfish/2464-replace-lxc-ps

Reimplement lxc-ps
Merge pull request #3239 from tianon/old-go-not-supported

Purge more hack references to Go 1.1.2
Fedora first letter capitalize and misc. rewording

Signed-off-by: Lokesh Mandvekar <lsm5@redhat.com>
Fix minor sphinx warning
Merge pull request #3237 from tianon/hack-fix-cover-detection

Fix "go tool cover" detection to only add -cover and -coverprofile if we...
Merge pull request #3221 from jamtur01/introlink

Updated Introduction link
Removed unnessary span element from version floater and
Replaced social footer by the one from www.docker.io
Merge pull request #3248 from lsm5/docker-fedora-conflict

Docker fedora conflict
Merge pull request #3249 from tianon/fix-sphinx-warning

Fix minor sphinx warning
Merge pull request #3236 from dhrp/doc-master-warning

Added warning when browsing master. & no longer hides alternative versions