Forms: fix removeGroup if control is in container
tests: temp dir is created non-recursive
mkdir() - 0777 is default
NetteExtension: checkTempDir() refactoring
Config: support for constants in arguments [Closes #550]
DI\ContainerBuilder: inject methods are called statically
Merge pull request #866 from HosipLan/bug/form-remove-group

Forms: fix removeGroup if control is in container
Merge branch 'master' of git://github.com/nette/nette