Add new option to hash filenames themselves rather than directory names
Tweak slightly greedy ignore rule so test results aren't ignored
Update tests for new file hash option
Update docs and package version
formatting fix
Merge pull request #1 from guardian/ma-file-hash

Add file hashing support
Make it possible to skip generation of asset map
Merge remote-tracking branch 'upstream/master'
Merge branch 'master' into add-references