Add back legacy styles for tick label containers.

These styles are deprecated, but we'll continue to use them until the
release of version 1.0.0, for backwards-compatibility.

jquery.flot.js

@@ -1273,7 +1273,8 @@ Licensed under the MIT license.
 
             var opts = axis.options, ticks = axis.ticks || [],
                 axisw = opts.labelWidth || 0, axish = opts.labelHeight || 0,
-                layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis",
+                legacyStyles = axis.direction + "Axis " + axis.direction + axis.n + "Axis",
+                layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis " + legacyStyles,
                 font = opts.font || "flot-tick-label tickLabel";
 
             for (var i = 0; i < ticks.length; ++i) {
@@ -2014,7 +2015,8 @@ Licensed under the MIT license.
                     return;
 
                 var box = axis.box,
-                    layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis",
+                    legacyStyles = axis.direction + "Axis " + axis.direction + axis.n + "Axis",
+                    layer = "flot-" + axis.direction + "-axis flot-" + axis.direction + axis.n + "-axis " + legacyStyles,
                     font = axis.options.font || "flot-tick-label tickLabel",
                     tick, x, y, halign, valign;