Added About modal with last commit hash, moved some dialogs to lesionTracker package from viewerbase (OHIF-52)

LesionTracker/.meteor/packages

@@ -63,3 +63,4 @@ hangingprotocols
 fastclick@1.0.12
 standard-minifier-css@1.1.8
 standard-minifier-js@1.1.8
+johdirr:meteor-git-rev

LesionTracker/.meteor/versions

@@ -65,6 +65,7 @@ iron:controller@1.0.12
 iron:core@1.0.11
 iron:dynamic-template@1.0.12
 iron:layout@1.0.12
+johdirr:meteor-git-rev@0.0.4
 jquery@1.11.9
 launch-screen@1.0.12
 lesiontracker@0.0.1