Merge branch 'master' into v3.0

Author: scheibel

.travis.yml

@@ -13,7 +13,7 @@ compiler:
 
 env:
   global:
-    - CMAKE_OPTIONS="-DOPTION_BUILD_EXAMPLES=On"
+    - CMAKE_OPTIONS="-DOPTION_BUILD_EXAMPLES=On -DOPTION_BUILD_TESTS=On"
   matrix:
     - CMAKE_CONFIGURATION=release BUILD_DIR=build
     - CMAKE_CONFIGURATION=debug BUILD_DIR=build-debug
@@ -37,4 +37,3 @@ before_script:
 script:
   - travis_wait cmake --build $BUILD_DIR
   - cmake --build $BUILD_DIR --target test
-  - cmake --build $BUILD_DIR --target check-all