add xml output of cppcheck
add gcovr utility
add rake target for coverage report
generate unit test xml output
update rakefile
make rake test:coverage play nice with jenkins
add travis-ci config
Fix throw/crash when using the tmpl_path ctor

Using a template_t constructed with a tmpl_path would throw/crash in
render() due to uninitialized member "section".
Namespaced
Merge branch 'master' of https://github.com/korczis/plustache into develop
Merge branch 'master' of https://github.com/FDj/plustache into develop