Documentation: fixup the admin_guide

- Provide more concrete examples and explanation
- Cleanup the formatting to one sentence per line, this makes reviewing
  easier
- Point to existing docs on wal and snap instead of trying to duplicate
  it here again.
Merge pull request #1556 from philips/fixup-the-admin-guide

Documentation: fixup the admin_guide
integration: clean up licenses and docs
Merge pull request #1565 from jonboulle/int

integration: clean up licenses and docs
*: name node{1,2,3} -> infra{1,2,3}

Be consistent with the naming in documentations.
etcdctl: add help on the members subcommands
Merge pull request #1567 from unihorn/199

*: name node{1,2,3} -> infra{1,2,3}
etcdctl: take a name and print out the initial cluster

To help the user lets print out the configuration that they will need to give
to their new member:

$ etcdctl member add infra4 http://localhost:7004
added member 9bf1b35fc7761a23 to cluster
ETCD_NAME="infra4"
ETCD_INITIAL_CLUSTER="node2=http://localhost:7002,node3=http://localhost:7003,infra4=http://localhost:7004,node1=http://localhost:7001"

This is a little weird because the API doesn't take a name so the user gives us
a name and we just pass it on through.
Merge pull request #1568 from philips/dynamic-configuration

etcdctl: two member fixes
Documentation: add the runtime configuration document
Merge pull request #1569 from philips/dynamic-configuration-docs

Documentation: add the runtime configuration document
version: bump to v0.5.0-alpha.1
etcdctl: clean up formatting of member add
raft: add tests based on section 5.3 in raft paper
Merge pull request #1528 from unihorn/191

raft: add tests based on section 5.3 in raft paper
client: return full http.Response in httpActionDo
client: s/transport/CancelableTransport/

CancelableTransport is implemented by callers of the
client pkg, so we should export it so it is
documented publicly.
client: use httpActionDo in httpClusterClient
client: s/newHTTPClusterClient/NewHTTPClient/
client: pass httpActionDo into New[Discovery]KeysAPI