Made tests run again. Still issue with memory leak in buffer.js on karma run under node x86

.appveyor.yml

@@ -2,11 +2,11 @@ image: Visual Studio 2017
 environment:
   matrix:
     - nodejs_version: "6"
-    - nodejs_version: "7"
-    - nodejs_version: "8" 
+    # - nodejs_version: "7"
+    # - nodejs_version: "8" 
     - nodejs_version: "9"
 platform:
-  - x86
+  # - x86
   - x64
 install:
   - ps: Install-Product node $env:nodejs_version $env:platform