Update CI scripts.

Former-commit-id: af2eb7ceedf1c9bab0cb178df3fc67b29d7b466d

.appveyor.yml

@@ -35,7 +35,7 @@ build_script:
   - cd tutorial
   - mkdir build
   - cd build
-  - cmake -DLIBIGL_USE_STATIC_LIBRARY=ON -G "Visual Studio 15 2017 Win64" ../
+  - cmake -DLIBIGL_USE_STATIC_LIBRARY=ON -G "Visual Studio 15 2017 Win64" -DBOOST_ROOT=${BOOST_ROOT} ../
   - set MSBuildLogger="C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll"
   - set MSBuildOptions=/v:m /p:Configuration=Debug /logger:%MSBuildLogger%
   - msbuild %MSBuildOptions% libigl_tutorials.sln

.travis.yml

@@ -49,6 +49,7 @@ install:
 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then brew install ccache; fi
 - if [[ "$TRAVIS_OS_NAME" == "osx" ]]; then export PATH="/usr/local/opt/ccache/libexec:$PATH"; fi
 - eval "${MATRIX_EVAL}"
+- ccache --set-config=max_size=5.0G
 - ccache -V && ccache --show-stats && ccache --zero-stats
 
 script: