GitLab

Add a .gitignore file.

Ignore the CMake build directory.

Fixed linker error on Visual Studio with a shared lib by moving the static methods node_data::equals to an instance method on node.

Add EmitterStyle, which will allow sequence or map style (i.e., flow or block) to be preserved between parsing and emitting

Add yaml-cpp-config.cmake and yaml-cpp-config-version.cmake files for importing yaml-cpp into external projects (through find_package).