prepare release 5.6.2

clasp/.gitignore

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+*.swp
+build*
+.vscode*
+CMakeLists.txt.user

clasp/.travis.yml

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+sudo: false
+language: cpp
+matrix:
+  include:
+    - os: linux
+      compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - george-edison55-precise-backports
+          packages:
+            - g++-4.9
+            - cmake
+            - cmake-data
+      env:
+        - COMPILER='g++-4.9'
+    - os: linux
+      compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - george-edison55-precise-backports
+          packages:
+            - g++-5
+            - cmake
+            - cmake-data
+      env:
+        - COMPILER='g++-5'
+    - os: linux
+      compiler: gcc
+      addons:
+        apt:
+          sources:
+            - ubuntu-toolchain-r-test
+            - george-edison55-precise-backports
+          packages:
+            - g++-8
+            - cmake
+            - cmake-data
+      env:
+        - COMPILER='g++-8'
+    - os: osx
+      osx_image: xcode8
+      env:
+        - COMPILER='clang++'
+
+install:
+  - export CMAKE=cmake  
+  - export CXX=$COMPILER
+  - $CMAKE --version
+  - $CXX --version
+script:
+  - mkdir $CXX-mt && cd $CXX-mt
+  - $CMAKE -DCMAKE_CXX_COMPILER=$CXX -DCLASP_BUILD_TESTS=ON -DCMAKE_BUILD_TYPE=Debug -DCMAKE_CXX_FLAGS="-Wall -Wextra" ../
+  - make -j3 && make test CTEST_OUTPUT_ON_FAILURE=1
+  - cd ../
+  - mkdir $CXX-st && cd $CXX-st
+  - $CMAKE -DCMAKE_CXX_COMPILER=$CXX -DCLASP_BUILD_TESTS=ON -DCLASP_BUILD_WITH_THREADS=OFF -DCMAKE_CXX_FLAGS="-Wall -Wextra" ../
+  - make -j3 && make test CTEST_OUTPUT_ON_FAILURE=1
+  - cd ../
+