Modified the marker and outline color model to allow specifying an array of RGBA tuples instead of a single color. The technique matches that used to support specifying an array of marker sizes. A new example was added that plots a scatterplot with random marker and outline colors. The modified scatterplot class maintains consistent behavior with the previous version and has been tested with the scatterplot demo.
DOC Remove reference to old 'enthought' namespace.
Merge pull request #118 from enthought/doc-remove-enthought

DOC Remove reference to old 'enthought' namespace.
First attempt at correcting problems with selection masks and the range selection tool.
Merge remote-tracking branch 'origin/feature/multi-colored-scatter-plot'
Merge remote-tracking branch 'remotes/origin/fix/range-selection-mask-problem'