Add Travis CI?

.travis.yml

@@ -0,0 +1,5 @@
+script:
+ - "test/travis.rb"
+language: ruby
+before_install:
+ - gem install sass

README.md

@@ -1,4 +1,4 @@
-# csswizardry-grids
+# csswizardry-grids [![Build Status](https://travis-ci.org/csswizardry/csswizardry-grids.svg?branch=master)](https://travis-ci.org/csswizardry/csswizardry-grids)
 
 **Simple, fluid, nestable, flexible, Sass-based, responsive grid system.**
 
@@ -90,15 +90,15 @@ If you are using traditional classes then an example, basic usage might look
 like this:
 
     <div class="grid">
-    
+
         <div class="grid__item  lap--one-half  desk--two-thirds">
             ...
         </div><!--
-    
+
      --><div class="grid__item  lap--one-half  desk--one-third">
             ...
         </div>
-    
+
     </div>
 
 It’s as simple as that!
@@ -127,34 +127,34 @@ If you are using silent classes (`$use-silent-classes: true;`) then your HTML
 might look like this:
 
     <div class="page">
-    
+
         <div class="content">
             ...
         </div><!--
-    
+
      --><div class="sub-content">
             ...
         </div>
-    
+
     </div>
 
 …and your Sass, something like this:
 
     .page{
         @extend %grid;
     }
-    
+
         .content,
         .sub-content{
             @extend %grid__item;
             @extend %one-whole;
             @extend %lap--one-half;
         }
-    
+
         .content{
             @extend %desk--two-thirds;
         }
-    
+
         .sub-content{
             @extend %desk--one-third;
         }

test/silent.scss

@@ -0,0 +1,2 @@
+$use-silent-classes: true;
+@import '../csswizardry-grids';

test/travis.rb

@@ -0,0 +1,10 @@
+#!/usr/bin/env ruby
+
+result = `sass csswizardry-grids.scss build.css`
+raise result unless $?.to_i == 0
+puts "Regular sass compiled successfully"
+
+result = `sass test/silent.scss build.silent.css --style compressed`
+raise result unless $?.to_i == 0
+raise "When $use-silent-classes is set to true the module should not output any CSS" unless File.size('build.silent.css') == 0
+puts "Silent sass compiled successfully"