Changelog:
== 1.6.5
* HighLine#list() now correctly handles empty lists (fix by Lachlan Dowding).
* HighLine#list() now supports <tt>:uneven_columns_across</tt> and
<tt>:uneven_columns_down</tt> modes.
== 1.6.4
* Add introspection methods to color_scheme: definition, keys, to_hash.
* Add tests for new methods.
== 1.6.3
* Add color NONE.
* Add RGB color capability.
* Made 'color' available as a class or instance method of HighLine, for
instance: HighLine.color("foo", :blue)) or highline_obj.color("foo", :blue)
are now both possible and equivalent.
* Add HighLine::String class with convenience methods: #color (alias
#foreground), #on (alias #background), colors, and styles. See
lib/string_extensions.rb.
* Add (optional) ability to extend String with the same convenience methods from
HighLine::String, using Highline.colorize_strings.
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