Fix bug in readline handling if multiple lines available #355
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See #354
bluepy may read multiple lines from the helper, but readline only
returns the first one. Subsequent calls to poll() will delay (and
possibly return None) because there is no way to know that additional
lines are ready to return.
This uses a very simple loop to queue an entry every time readline
returns a line. The queue lets you easily check for ready lines, as
well as supporting get() with a timeout.