Add version generation and display

The control center version includes versions of the bundled ndn-cxx,
NFD, and ndn-tools.  The implementation is a bit hacky and most of the
the logic should be moved to the build script eventually.

Change-Id: Ie5f33c62f5e35a6a727c038ca0a3e03385dbd7db
diff --git a/src/main.qml b/src/main.qml
index b051c6c..eaa3b3a 100644
--- a/src/main.qml
+++ b/src/main.qml
@@ -91,6 +91,19 @@
                         }
                     }
                 }
+                GridLayout {
+                     anchors.left: parent.left
+                     anchors.bottom: parent.bottom
+                     Label {
+                         text: "NFD Control Center version:"
+                         font.pixelSize: 10
+                     }
+                     Label {
+                         text: nccVersion
+                         font.pixelSize: 10
+                         font.bold: true
+                     }
+                }
             }
         }
         // Tab {