Support color values in the middle of the variable string
Unit tests for modules/io.js.
Merge pull request #256 from hannu/parse-color-values

Support color values also in the middle of the variable string
Support 3-character shorthand CSS colors
Merge pull request #257 from jpbackman/add-io-unit-tests

Unit tests for modules/io.js
Merge pull request #258 from hannu/shorthand-support

Support 3-character shorthand CSS colors