mod_lock
mod/lock
Merge branch 'master' of https://github.com/coreos/etcd into mod-lock

Conflicts:
	mod/mod.go
Initial mod_lock acquire.
Lock testing.
Merge branch 'master' of https://github.com/coreos/etcd into mod-lock
Fix test harness.
Add mod/lock connection monitoring.
Add mod/lock version.
Merge branch 'master' of https://github.com/coreos/etcd into mod-lock

Conflicts:
	server/v2/tests/delete_handler_test.go
	server/v2/tests/get_handler_test.go
	server/v2/tests/post_handler_test.go
	server/v2/tests/put_handler_test.go
	third_party/github.com/coreos/go-etcd/etcd/requests.go
Update mod/lock versioning.
Merge pull request #347 from benbjohnson/mod-lock

WIP: mod/lock