Added parseFont() string support for font family

lib/canvas.js

@@ -76,7 +76,7 @@ function normalizedColor(prop) {
 exports.parseFont = function(str){
   if (cache[str]) return cache[str];
   var obj = {}
-    , captures = /^ *(\d+)(px|pt) *([\w-]+( *, *[\w-]+)*)/.exec(str);
+    , captures = /^ *(\d+)(px|pt) *((?:"([^"]+)"|[\w-]+)( *, *(?:"([^"]+)"|[\w-]+))*)/.exec(str);
   if (!captures) return;
   obj.size = parseInt(captures[1], 10);
   obj.unit = captures[2];

test/canvas.test.js

@@ -73,6 +73,12 @@ module.exports = {
       , { size: 20, unit: 'px', family: 'monospace' }
       , '50px Arial, sans-serif'
       , { size: 50, unit: 'px', family: 'Arial, sans-serif' }
+      , '50px Helvetica ,  Arial, sans-serif'
+      , { size: 50, unit: 'px', family: 'Helvetica ,  Arial, sans-serif' }
+      , '50px "Helvetica Nueue", sans-serif'
+      , { size: 50, unit: 'px', family: '"Helvetica Nueue", sans-serif' }
+      , '50px "Helvetica Nueue", "foo bar baz" , sans-serif'
+      , { size: 50, unit: 'px', family: '"Helvetica Nueue", "foo bar baz" , sans-serif' }
     ];
 
     for (var i = 0, len = tests.length; i < len; ++i) {