Fix research icons.;

index.html

@@ -15,8 +15,7 @@
         <hr>
         <ul class="media-list">
           <li class="media" ng-repeat="r in rc.research" ng-show="r.is_visible()">
-            <img ng-show="r.level > 0" class="pull-left" class="media-object" src="{{ r.image }}" alt="">
-            <img ng-hide="r.level > 0" class="pull-left" class="media-object" src="assets/unknown.png" alt="">
+            <img class="pull-left" class="media-object" src="{{ r.level > 0 ? r.image : 'assets/unknown.png' }}" alt="">
             <div class="media-body">
               <h4 class="media-heading">{{ r.level > 0 ? r.name : '?????' }} <span ng-show="r.level > 0" class="badge">Level {{ r.level }}</span></h4>
               <p ng-show="r.level > 0">{{ r.description }} Researching it will give you {{ r.reputation }} reputation.</p>

json/research.json

@@ -5,6 +5,7 @@
     "reputation": 1,
     "cost": 10,
     "cost_increase": 1.4,
+    "image": "assets/W.png",
     "info": "html/W.html"
   },
   {
@@ -13,6 +14,7 @@
     "reputation": 5,
     "cost": 100,
     "cost_increase": 1.45,
+    "image": "assets/Z.png",
     "info": "html/Z.html"
   },
   {
@@ -21,6 +23,7 @@
     "reputation": 50,
     "cost": 2000,
     "cost_increase": 1.5,
+    "image": "assets/t.png",
     "info": "html/t.html"
   },
   {
@@ -29,6 +32,7 @@
     "reputation": 100,
     "cost": 25000,
     "cost_increase": 1.55,
+    "image": "assets/nu.png",
     "info": "html/nu.html"
   },
   {