main/raft: write addNode ConfChange entries in log when start raft
documentation: clustering guide fixes
etcdserver: move int64Slice into pkg/types/
Merge pull request #1247 from jonboulle/doc

documentation: clustering guide fixes
raft: refine initial entries logic in StartNode
main: fix temporary discovery cluster
Split config into a separate file and add sanity check and test
Merge pull request #1248 from jonboulle/disco

main: fix temporary discovery cluster
Merge pull request #1245 from unihorn/155

main/raft: write addNode ConfChange entries in log when start raft
tableize the test
remove new cluster check
add golint on the new box and fix appropriate lint
Merge pull request #1249 from barakmich/sanity_check

Split config into a separate file and add sanity check and test