poland (and includes a tiny refactor about corpus christi) refs #19
marshall islands
add Manifest to distrib to make sure the README is included
Merge pull request #60 from novapost/marshall-islands

marshall islands
Panama.
Merge pull request #61 from novapost/poland

poland
Merge pull request #63 from novapost/panama

Panama
Merge branch 'master' into greece

Conflicts:
	workalendar/core.py
	workalendar/tests/test_europe.py