Use only one configuration per platform/compiler in travis

.travis.yml

@@ -11,10 +11,10 @@ os:
   - osx
 
 env:
-  - CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Release" # Default
-  - CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Debug -DBUILD_SHARED_LIBS=OFF"   # Default (Debug mode + static libs)
+    #- CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Release" # Default
+    #- CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Debug -DBUILD_SHARED_LIBS=OFF"   # Default (Debug mode + static libs)
   - CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Release -DEXIV2_ENABLE_VIDEO=ON -DEXIV2_ENABLE_WEBREADY=ON" # All enabled
-  - CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Release -DEXIV2_ENABLE_XMP=OFF -DEXIV2_ENABLE_NLS=OFF -DEXIV2_ENABLE_LENSDATA=OFF" # All disabled
+    #- CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Release -DEXIV2_ENABLE_XMP=OFF -DEXIV2_ENABLE_NLS=OFF -DEXIV2_ENABLE_LENSDATA=OFF" # All disabled
     #- CMAKE_OPTIONS="-DCMAKE_BUILD_TYPE=Release -DEXIV2_ENABLE_WEBREADY=ON -DEXIV2_ENABLE_CURL=OFF -DEXIV2_ENABLE_SSH=OFF" # WebReady without SSH nor CURL
 
 install: ./.travis/install.sh