travis: add a sleep before starting test to ensure database is ready; adjust ruby matrix
dcell#setup: ensure that ID is generated when registry is ready
dcell: remove method that is not ever tested
dcell: cover id generation cases and registry BE selection
spec: move DCellMock to spec helpers
spec: move dummy and noop registry adapters to spec helpers
dcell:server: do not reference global DCell instance
dcell:server: split async with generic parts for better unit testing
spec: cover server initialization and message handling
spec: remove dead code
remove rspec warnings as they are distructing
spec: implicitly require spec_helper
actor proxy: extend spec
a tricky way to merge coveralls results of test node
spec:testnode: use Process.exit instead of shutdown naively copied from ruby doc
spec:coveralls: define timeout for result merging
spec: generate local html simplecov report
spec: remove dead code
spec: cover explorer
support node migration