Updated appveyor.yml to use new solution.

appveyor.yml

@@ -1,4 +1,4 @@
-image: Visual Studio 2015
+image: Visual Studio 2013
 # This is the default location, but we put it here for safety reasons, since we use it in our test script
 clone_folder: c:\projects\rathena
 # We do not need the git history for our integration tests
@@ -8,29 +8,11 @@ pull_requests:
   do_not_increment_build_number: true
 environment:
   matrix:
-  - VisualStudioVersion: 10.0
-    Solution: rAthena-10.sln
-    Defines: "\"BUILDBOT\""
-  - VisualStudioVersion: 11.0
-    Solution: rAthena-12.sln
-    Defines: "\"BUILDBOT\""
-  - VisualStudioVersion: 12.0
-    Solution: rAthena-13.sln
-    Defines: "\"BUILDBOT\""
   - VisualStudioVersion: 14.0
-    Solution: rAthena-14.sln
+    Solution: rAthena.sln
     Defines: "\"BUILDBOT\""
-  - VisualStudioVersion: 10.0
-    Solution: rAthena-10.sln
-    Defines: "\"BUILDBOT;PRERE\""
-  - VisualStudioVersion: 11.0
-    Solution: rAthena-12.sln
-    Defines: "\"BUILDBOT;PRERE\""
-  - VisualStudioVersion: 12.0
-    Solution: rAthena-13.sln
-    Defines: "\"BUILDBOT;PRERE\""
   - VisualStudioVersion: 14.0
-    Solution: rAthena-14.sln
+    Solution: rAthena.sln
     Defines: "\"BUILDBOT;PRERE\""
 platform:
   - Win32