Log Message:
Update ruby-color to 1.8.

== 1.8 / 2015-10-26

* 1 minor enhancement:

  * Add an optional +alpha+ parameter to all #css_rgba calls. Thanks to Luke
    Bennellick (@bennell) and Alexander Popov (@AlexWayfer) for independently
    implemented submissions. Merged from #15.

* 2 minor bug fixes:

  * Improve constant detection to prevent incorrectly identified name
    collisions with various other libraries such as Azure deployment tools.
    Based on work by Matthew Draper (@matthewd) in #24.

  * Prevent Color.equivalent? comparisons from using non-Color types for
    comparison. Fix provided by Benjamin Guest (@bguest) in #18.

* 1 governance change

  * This project now has a {Code of Conduct}[Code-of-Conduct_rdoc.html]