Fixed bokeh SideHistogram with (non)inverted axis

[philippjfr]

When plotting an adjoint histogram in bokeh the dynamic color range functionality was not set up to handle an adjoint plot at the top.

[jlstevens]

Thanks for this. I tested it out on a number of fairly complex examples and it does seem to be fixed. Happy to merge if you think this PR is ready.

[philippjfr]

Seems to need new test data:

[{'values_changed': {"root['roots']['references'][27]['attributes']['code']": {'new_value': u"
 color_mapper.low = cb_data['geometry']['y0'];
 color_mapper.high = cb_data['geometry']['y1'];
 source.change.emit()
 main_source.change.emit()
 ", 'old_value': u"
 color_mapper.low = cb_data['geometry']['y0'];
 color_mapper.high = cb_data['geometry']['y1'];
 source.change.emit(undefined)
 main_source.change.emit(undefined)
 ", 'diff': u"--- 
+++ 
@@ -1,6 +1,6 @@
 
 color_mapper.low = cb_data['geometry']['y0'];
 color_mapper.high = cb_data['geometry']['y1'];
- source.change.emit(undefined)
- main_source.change.emit(undefined)
+ source.change.emit()
+ main_source.change.emit()
 "}}}]

[philippjfr]

Hmm, I just got used to putting those undefined in because it's a TypeScript error, can remove them again and it should pass.

[jlstevens]

Tests are passing. Merging.