NOBUG: Fixed SVG browser compatibility

lib/editor/atto/pix/logo.svg

@@ -14,7 +14,7 @@
    id="svg2"
    version="1.1"
    inkscape:version="0.48.3.1 r9886"
-   sodipodi:docname="New document 1">
+   sodipodi:docname="New document 1" preserveAspectRatio="xMinYMid meet">
   <defs
      id="defs4" />
   <sodipodi:namedview

lib/editor/atto/plugins/collapse/pix/icon.svg

@@ -14,7 +14,7 @@
    inkscape:version="0.48.3.1 r9886"
    width="16"
    height="16"
-   sodipodi:docname="icon.svg">
+   sodipodi:docname="icon.svg" preserveAspectRatio="xMinYMid meet">
   <metadata
      id="metadata8">
     <rdf:RDF>

pix/e/accessibility_checker.svg

@@ -6,7 +6,7 @@
 <svg version="1.1"
 	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
 	 x="0px" y="0px" width="16px" height="16px" viewBox="-0.1 0 16 16" style="overflow:visible;enable-background:new -0.1 0 16 16;"
-	 xml:space="preserve">
+	 xml:space="preserve" preserveAspectRatio="xMinYMid meet">
 <defs>
 </defs>
 <path style="fill:#989898;" d="M15.8,8c0-1.9-3.6-5.5-7.9-5.5c-0.7,0-1.5,0.1-2.1,0.3L4.1,0H3l1.8,3.2C2,4.3,0,6.6,0,8

pix/e/screenreader_helper.svg

@@ -6,7 +6,7 @@
 <svg version="1.1"
 	 xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:a="http://ns.adobe.com/AdobeSVGViewerExtensions/3.0/"
 	 x="0px" y="0px" width="16px" height="16px" viewBox="-1.6 -0.1 16 16"
-	 style="overflow:visible;enable-background:new -1.6 -0.1 16 16;" xml:space="preserve">
+	 style="overflow:visible;enable-background:new -1.6 -0.1 16 16;" xml:space="preserve" preserveAspectRatio="xMinYMid meet">
 <defs>
 </defs>
 <path style="fill:#989898;" d="M13.1,9.2c-0.9,2.6-4.9,4.1-4.9,4.1C7.7,13.5,7,14.6,7,14.6s-1,1.5-1.5,1.3c0,0-0.7-0.1-1.9-0.5