Bug graph zoom on firefox :

- fontawesome removed
- replaced by font-family courier

docs/example1.html

@@ -18,7 +18,6 @@
 	<!-- jflow css -->
 	<link href="../src/css/handsontable.full.min.css" rel="stylesheet">
 	<link href="../src/css/cytoscape.js-panzoom.css" rel="stylesheet" type="text/css">
-	<link href="../src/css/font-awesome.css" rel="stylesheet" type="text/css">
 	<link href="../src/css/datepicker.css" rel="stylesheet">
 	<link href="../src/css/jflow.css" rel="stylesheet">
 

src/css/cytoscape.js-panzoom.css

@@ -40,6 +40,7 @@
 
 .ui-cytoscape-panzoom-reset {
 	top: 55px;
+	padding-top: 2px;
 }
 
 .ui-cytoscape-panzoom-zoom-in {
@@ -143,7 +144,7 @@
 }
 
 .ui-cytoscape-panzoom-slider-handle .icon {
-	margin: 0 4px;
+	margin: -1px 4px 1px 4px;
 	line-height: 10px;
 }
 
@@ -183,5 +184,23 @@
 	z-index: 999;
 }
 
-
-
+.fa {
+	font-family: courier;
+	display: inline-block;
+	font-style: normal;
+	font-weight: bold;
+	line-height: 1;
+	-webkit-font-smoothing: antialiased;
+	-moz-osx-font-smoothing: grayscale;
+	font-size: 15px;
+	margin-top: -2px;
+}
+.fa-expand:before {
+	content: "o";
+}
+.fa-plus:before {
+	content: "+";
+}
+.fa-minus:before {
+	content: "-";
+}
\ No newline at end of file