Support multiple delimiter options

[dd388]

As referenced in Issue #3, the user should be able to specify which path delimiter format should be used for fileobjects and how the resource forks should be represented. Copied from the aforementioned Issue:

filename:rsrc - As the path would appear in pre-OS X systems
filename/rsrc - As the path would appear in OS 10.0-10.6 systems
filename/..namedfork/rsrc - As the path would appear in OS 10.7 and above systems

[dd388]

Started here:
f0a0e40

How this maps to options:
'classic' - :directory:file
'macosx' - /directory/file
'osx' - /directory/file

Which doesn't precisely map to Apple's reference (10.7/10.8; https://en.wikipedia.org/wiki/Macintosh_operating_systems#Desktop) but is close enough.

The commit referenced in this comment is only for delimiters for filenames. Separate fileobjects for resource forks is another issue, though related to this one.

[dd388]

It's worth noting that the delimiter options are now only available in the Python3 branch