Prevent scheduler from crashing infinitely if apiserver is unreachable
Add a pkg for iptables support

This makes iptables an injectable dependency.  The test for this started off
simple, but got a bit out of hand.  It's starting to become a mocking
framework.
Update the UX, add documentation.
Merge pull request #1613 from ghodss/fix_infinite_scheduler_crash

Prevent scheduler from crashing infinitely if apiserver is unreachable
Merge pull request #1630 from brendandburns/nginx

Add a missing file that should have been in the previous ux push.
Fix build error in integration test
Merge pull request #1631 from lavalamp/fix

Fix build error in integration test
Use etcd as backend for minion registry.
Rename InsertMinion to CreateMinion.
Rebase to master, change JSONBase to TypeMeta.
podex - DOCKER_HOST envar check
Merge pull request #1632 from brendandburns/fix

Fix the exec test, on os x false and true have different paths
Merge pull request #1478 from ddysher/minion-etcd

Use etcd as backend for minion registry.
Merge pull request #1620 from jhadvig/podex_envar

podex - DOCKER_HOST envar check
Fix malformed namespace json tag
Add the missing arg in Errorf.
fix error message in validation test
fix captured loop variable
Fix struct tag in apparently untested config struct
Merge pull request #1636 from dchen1107/termination

Add the missing arg in Errorf.