more flexible 'index' option for directory handler
added unit tests
directory handler index option supports array of strings
Merge remote-tracking branch 'upstream/master' into moreFlexibleIndexOption

Conflicts:
	lib/directory.js
	test/directory.js
Merge pull request #10 from yortus/moreFlexibleIndexOption

more flexible 'index' option for directory handler
Cleanup for #10