client: use all endpoints
docs: fix usage of peers urls
Merge pull request #1575 from coreos/improve-admin-docs

docs: fix usage of peers urls
docs: clean up clustering doc
Merge pull request #1579 from coreos/cleanup-clustering-doc

docs: clean up clustering doc
Merge pull request #1570 from bcwaldon/client-endpoints

client: use all endpoints
etcdserver: panic on storage error

It is a critical error to etcd, and etcd is not able to recover it now.
Merge pull request #1478 from unihorn/190

etcdserver: panic on storage error
client: follow redirects