Fix plot legend padding.

Added explicit border-spacing to compensate for global removal of
padding.  Flot should really take care of this itself; layout-critical
styles shouldn't depend on the user-agent defaults.

examples/examples.css

@@ -69,4 +69,10 @@ p {
 #placeholder {
 	width: 100%;
 	height: 100%;
+	font-size: 14px;
+	line-height: 14px;
 }
+
+.legend table {
+	border-spacing: 5px;
+}