Missing imports in one of the examples. Import ComponentEditor from enable.api. Replaced all __init__ by _plot_default.
Fixed a _default that wasn't returning anything and added some missing import for connected plots.
Minor improvements.
Update the mailing list from chaco-users to enthought-dev.
Merge pull request #166 from enthought/enhancement/chaco_tutorial_improvements

[ENH] [DOC] chaco tutorial improvements