Swap from colors to chalk

Closes #174

lib/render.js

 var sass = require('../sass'),
-    colors = require('colors'),
+    chalk = require('chalk'),
     fs = require('fs');
 
 function render(options, emitter) {
@@ -11,11 +11,11 @@ function render(options, emitter) {
     sourceComments: options.sourceComments,
     success: function(css) {
 
-      emitter.emit('warn', 'Rendering Complete, saving .css file...'.green);
+      emitter.emit('warn', chalk.green('Rendering Complete, saving .css file...'));
 
       fs.writeFile(options.outFile, css, function(err) {
-        if (err) { return emitter.emit('error', ('Error: ' + err).red); }
-        emitter.emit('warn', ('Wrote CSS to ' + options.outFile).green);
+        if (err) { return emitter.emit('error', chalk.red('Error: ' + err)); }
+        emitter.emit('warn', chalk.green('Wrote CSS to ' + options.outFile));
         emitter.emit('write', err, options.outFile, css);
       });
 

package.json

@@ -37,9 +37,9 @@
   },
   "dependencies": {
     "mkdirp": "0.3.x",
-    "colors": "0.6.0-1",
     "optimist": "0.6.x",
     "node-watch": "0.3.x",
-    "mocha": "1.13.x"
+    "mocha": "1.13.x",
+    "chalk": "~0.3.0"
   }
 }