VRFS-2823 : Enable proper back button behavior.

web/app/assets/javascripts/jamtrack.coffee

@@ -51,6 +51,7 @@ context.JK.JamTrackScreen=class JamTrackScreen
       @instrument.val(parms.instrument)
     if(parms.availability?)
       @availability.val(parms.availability)
+    window.history.replaceState({}, "", "/client#/jamtrack")
 
   getParams:() =>
     params = {}      

web/app/assets/javascripts/jamtrack_landing.js.coffee

@@ -47,7 +47,7 @@ context.JK.JamTrackLanding = class JamTrackLanding
     that=this
     band_list.on "click", "a.artist-link", (event)->       
       context.location="client#/jamtrack"
-      window.history.pushState({}, "", this.href)                  
+      window.history.replaceState({}, "", this.href)
       event.preventDefault()
       
   handleFailure:(error) =>