fix cppcheck warning: use reference
fix cppcheck warning: explicit parentheses
fix cppcheck warning: missing variables in operator=
fix cppcheck warning: operator= signature
Params: bug fix, initialization with default value
fix cppcheck warning: remove unused var
Crop: bug fix in changed param updates
Crop: crop by default in the crop node
travis: don't reinstall packages
travis: simplify dependencies installation
Merge branch 'dev_travis_macos' into pr-350

Conflicts:
	tools/travis/build.sh
travis: make -k