Fix gradient tests

Author: niklasvh

dist/html2canvas.js

@@ -2412,7 +2412,7 @@ module.exports = ImageLoader;
 var GradientContainer = require('./gradientcontainer');
 var Color = require('./color');
 
-var COLOR_STOP_REGEXP = /^(.*)\s*(\d{1,3})?(%|px)?$/;
+var COLOR_STOP_REGEXP = /^\s*(.*)\s*(\d{1,3})?(%|px)?$/;
 
 function LinearGradientContainer(imageData) {
     GradientContainer.apply(this, arguments);
@@ -2454,7 +2454,6 @@ function LinearGradientContainer(imageData) {
         this.y1 = 1;
     }
 
-
     this.colorStops = imageData.args.slice(hasDirection ? 1 : 0)
         .map(function(colorStop) { return colorStop.match(COLOR_STOP_REGEXP);})
         .filter(function(colorStopMatch) { return !!colorStopMatch;})

dist/html2canvas.min.js

@@ -1,7 +1,7 @@
 var GradientContainer = require('./gradientcontainer');
 var Color = require('./color');
 
-var COLOR_STOP_REGEXP = /^(.*)\s*(\d{1,3})?(%|px)?$/;
+var COLOR_STOP_REGEXP = /^\s*(.*)\s*(\d{1,3})?(%|px)?$/;
 
 function LinearGradientContainer(imageData) {
     GradientContainer.apply(this, arguments);
@@ -43,7 +43,6 @@ function LinearGradientContainer(imageData) {
         this.y1 = 1;
     }
 
-
     this.colorStops = imageData.args.slice(hasDirection ? 1 : 0)
         .map(function(colorStop) { return colorStop.match(COLOR_STOP_REGEXP);})
         .filter(function(colorStopMatch) { return !!colorStopMatch;})

src/lineargradientcontainer.js

@@ -110,6 +110,7 @@
         }
 
         .linearGradient4 {
+            background: -webkit-linear-gradient(0deg, #ddd, #ddd 50%, transparent 50%);
             background: linear-gradient(0deg, #ddd, #ddd 50%, transparent 50%);
         }