Add ability to set color capability on loggocolor #34
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I've run across a situation where I would like to force loggocolor to write colors (in this case, writing to a termcap view which implements io.Writer). However,
github.com/juju/ansiterm
does not see this as a terminal - rightly so - so this branch calls `ansiterm.Writer.SetColorCapable before returning loggocolor.Writer in the