LearnBoost/stylus — pull request #643 by gravof (2012-04-25 13:24:06+00:00)
Title: Remove trailing zeros from alpha number in rgba

so that

body
color: rgba(0, 0, 0, 0)

generates:

body {
color: rgba(0, 0, 0, 0);
}

instead of:

body {
color: rgba(0, 0, 0, 0.00);
}

I also took the liberty to increase the fixed-point value (`.toFixed()`) to 3 to support more fine-grained value.