Add be_file and be_directory of file type
Add contain matcher for file type
Add specs for file type
Add be_mode, be_linked_to, be_grouped_into and be_owned_by matchers for file type
Add readable, writeable and executable matchers for file type
Add mounted and match_md5checksum matchers to file type
Merge pull request #109 from mizzy/explicit-file-subject-type

Explicit file subject type