Merge branch 'stable-0.8' and fix a variable typo bug

Author: basnijholt

adaptive/notebook_integration.py

@@ -127,7 +127,7 @@ def plot_generator():
             else:
                 yield plotter(runner.learner)
 
-    steams = [hv.streams.Stream.define("Next")()]
+    streams = [hv.streams.Stream.define("Next")()]
     dm = hv.DynamicMap(plot_generator(), streams=streams)
 
     if normalize: