Make scatterplots use `effective_color` when rendering markers.
Creating demo showing how to use an asynchronizer with chaco.
Fixing erroneous method name in documentation.
Providing a better title.
Adding new demo to demo.cfg.
Clarifying dependent package requirements.
Merge pull request #170 from enthought/enh-demo-asynchronizer

Demo showing how to use an Asynchronizer from encore in the context of chaco.
Fixing typo.
Merge pull request #171 from enthought/fix-typo

Fixing typo introduced in #170
Add example which demonstrates issue (works in this branch, fails otherwise).
Improve the style of the example somewhat.
Merge branch 'master' into bugfix/scatterplot_effective_colour
Add to CHANGES.txt
Merge pull request #164 from enthought/bugfix/scatterplot_effective_colour

Fix scatterplot alpha rendering
Merge branch 'master' into fix/restore_optimized_scatterplot

Conflicts:
	CHANGES.txt