Adding DIV layer to hotkeys/presets forms and new stylus mixins

Packages/ohif-core/client/components/bootstrap/dialog/form.html

@@ -1,5 +1,5 @@
 <template name="dialogForm">
-    <div id="{{this.id}}" class="modal fade" tabindex="-1" role="dialog">
+    <div id="{{this.id}}" class="modal fade {{this.class}}" tabindex="-1" role="dialog">
         <div class="modal-dialog {{this.dialogClass}}" role="document">
             {{#form class='modal-content' hideValidationBox=true
                 api=(extend instance.api instance.data.api) schema=this.schema

Packages/ohif-core/client/components/bootstrap/dialog/loading.html

@@ -1,5 +1,5 @@
 <template name="dialogLoading">
-    <div id="{{this.id}}" class="modal fade" tabindex="-1" role="dialog">
+    <div id="{{this.id}}" class="modal fade {{this.class}}" tabindex="-1" role="dialog">
         <div class="loading-text noselect">
             {{choose this.text 'Loading...'}} <i class="fa fa-spin fa-circle-o-notch fa-fw"></i>
         </div>

Packages/ohif-core/client/components/bootstrap/dialog/simple.html

@@ -1,5 +1,5 @@
 <template name="dialogSimple">
-    <div id="{{this.id}}" class="modal fade" tabindex="-1" role="dialog">
+    <div id="{{this.id}}" class="modal fade {{this.class}}" tabindex="-1" role="dialog">
         <div class="modal-dialog {{this.dialogClass}}" role="document">
             <div class="modal-content">
                 {{>dialogHeader this}}