<@U0BHS1Y07> Sequence interface has the single abs...

# coroutines

[ilya.gorbunov]

@voddan Sequence interface has the single abstract method, and that function is like SAM-constructor. Due to that Sequence one has a way to construct a sequence like http://stackoverflow.com/questions/36892291/how-to-convert-java-util-stream-streamsomething-into-kotlin-sequencesomething/36892511#36892511