Moved to before stack to enable stacked bar graphs to work with categ…

…ories

gulpfile.js

@@ -26,14 +26,14 @@ var files = [
     './source/jquery.flot.flatdata.js',
     './source/jquery.flot.navigate.js',
     './source/jquery.flot.fillbetween.js',
+    './source/jquery.flot.categories.js',
     './source/jquery.flot.stack.js',
     './source/jquery.flot.touchNavigate.js',
     './source/jquery.flot.hover.js',
     './source/jquery.flot.touch.js',
     './source/jquery.flot.time.js',
     './source/jquery.flot.axislabels.js',
     './source/jquery.flot.selection.js',
-    './source/jquery.flot.categories.js',
     './source/jquery.flot.composeImages.js',
     './source/jquery.flot.legend.js'
 ];