fix(aws): error with other instances without tags

while starting the cluster, and having already other non-kubernetes
instances active without tags, an KeyError throwed.
enhancement(aws): checks for existing kubernetes vpc first

without this check, kube-up creates a new vpc every time. Now it will
reuse the vpc tagged Kubernetes.
enhancement(aws): using iam role to pass aws credentials
enhancement(aws): added logging variable and more verbose output
fix(aws): fix with non us standard region
fix(aws): cloud provider wasn't set, corrected cloud config syntax
Specify AWS_DEFAULT_REGION to match configured region

The AWS CLI is configured with a default region, but it might not match
the configured Kubernetes region.  Specify the region to be sure.
unit test for #2815, as requested by @brendandburns
Add Type() method on flags for compat with pflag library

Allows our flag objects to be used with both golang flags and pflags
Fixes #1605: make ErrorList introspectable by replacing ErrorList and
ErrorList#ToError with []error and util.SliceToError() respectively
Create README.md in docs/devel
Add support for TAP (test anything protocol) output
Move salt based clusters to Docker 1.3.3

Part of #2896
Merge pull request #2898 from jbeda/docker-1.3.3

Move salt based clusters to Docker 1.3.3
Make multiple attempts to sanity check (GCE) and validate (ALL) cluster
Count only non-dead pods in replicationController current state replicas count.
Merge pull request #2816 from satnam6502/robust

Make multiple attempts to sanity check (GCE) and validate (ALL) cluster
Rename ServerOp to Operation in v1beta3 and internal

Add the appropriate rename logic internally.
PodStatus Message needs to be round-trippable
Status should be a ListMeta, not ObjectMeta internally