CI refactoring

- Travis CI instead CircleCI
- Build scripts
- Move test sources to root folder
- Update Catch

scripts/build_debug.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+set -e
+BUILD_DIR=`dirname "$BASH_SOURCE"`/../build
+mkdir -p $BUILD_DIR/debug
+cd $BUILD_DIR/debug
+cmake -DCMAKE_BUILD_TYPE=Debug ../..
+cmake --build . -- -j8
+ctest --verbose
+cd ../..