Use block shas for rescan begin/end.

Also send block sha and block time for rescanprogress/finished.

ok @davecgh
Allow websocket conns to be established after New.

ok @davecgh
IMPORT PATH MODIFICATION CHANGESET
----------------------------------

Please use this changeset as the first one on top of the conformal codebase.
Note that if there are new imports, they need to be changed as part of this
changeset. In general, use "git rebase" on github.com/conformal's version
and apply this changeset first.