Added hotkey support to viewerbase

Packages/viewerbase/client/components/studyBrowser/thumbnailEntry/thumbnailEntry.styl

@@ -0,0 +1,24 @@
+.thumbnailEntry
+  width: 105px
+  padding: 5px
+  background-color: black
+  border: 1px solid #424242
+  margin: 0 auto
+  cursor: copy
+  cursor: -webkit-grab
+  cursor: -moz-grab
+  
+  .seriesDescription
+    text-align: center
+    color: #555
+    word-wrap: break-word
+    
+  &:hover
+    background-color: white
+      
+  &.active
+    background-color: #424242
+    border-color: #4e4e4e
+    
+    .seriesDescription
+      color: white