fix keyframes float percentages

Author: tj

index.js

@@ -125,7 +125,7 @@ module.exports = function(css){
     var m;
     var vals = [];
 
-    while (m = match(/^(from|to|\d+%)\s*/)) {
+    while (m = match(/^(from|to|\d+%|\.\d+%|\d+\.\d+%)\s*/)) {
       vals.push(m[1]);
       match(/^,\s*/);
     }

test/cases/keyframes.complex.css

@@ -1,7 +1,7 @@
 @keyframes foo {
   0% { top: 0; left: 0 }
-  30% { top: 50px }
-  68% ,
+  30.50% { top: 50px }
+  .68% ,
   72%
       , 85% { left: 50px }
   100% { top: 100px; left: 100% }

test/cases/keyframes.complex.json

@@ -21,7 +21,7 @@
           },
           {
             "values": [
-              "30%"
+              "30.50%"
             ],
             "declarations": [
               {
@@ -32,7 +32,7 @@
           },
           {
             "values": [
-              "68%",
+              ".68%",
               "72%",
               "85%"
             ],