[Continuous Integration] More extensive compiler coverage openMVG#1145

- add Visual Studio 2017 to the Windows Continuous Integration.
 - Testing the matrix (Win32, Win63, Debud, Release, VS2015, VS2017)

appveyor.yml

@@ -7,28 +7,42 @@ install:
 
 environment:
   matrix:
-    - GENERATOR: "Visual Studio 14 2015 Win64"
-    - GENERATOR: "Visual Studio 14 2015"
+  # Visual Studio 2015 Win32
+  - GENERATOR: Visual Studio 14 2015
+    PLATFORM: Win32
+    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+
+  # Visual Studio 2015 x64
+  - GENERATOR: Visual Studio 14 2015 Win64
+    PLATFORM: x64
+    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2015
+
+  # Visual Studio 2017 Win32
+  - GENERATOR: Visual Studio 15 2017
+    PLATFORM: Win32
+    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
+
+  # Visual Studio 2017 x64
+  - GENERATOR: Visual Studio 15 2017 Win64
+    PLATFORM: x64
+    APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2017
 
-# build configuration, i.e. Debug, Release, etc.
 configuration:
   - Debug
   - Release
 
-build_script:
+before_build:
   - cd c:\dev\openMVG
   - md openMVG_build
   - cd openMVG_build
   # Configure:
-  # - ceres - SCHUR_SPECIALIZATIONS set to OFF to speed up build time 
+  # - ceres - SCHUR_SPECIALIZATIONS is set to OFF to speed up the build time
   - cmake -G"%GENERATOR%" -DCMAKE_BUILD_TYPE=%configuration% -DOpenMVG_BUILD_EXAMPLES=OFF -DOpenMVG_BUILD_TESTS=ON -DSCHUR_SPECIALIZATIONS=OFF ../src/
-  # Build:
-  - cmake --build . --config %configuration% 
-
-test_script:
-  - ctest -C %configuration% -V
 
 build:
+  project: c:\dev\openMVG\openMVG_Build\openMVG.sln
   parallel: true
   verbosity: minimal
 
+test_script:
+  - ctest -C %configuration% -V