initial version of obj exporter
add tests for export_obj
Fix greyscale PIL images

Slice off the channel for greyscale images
Add test for this as well
Merge branch 'master' into pil_fix
Merge pull request #406 from patricksnape/pil_fix

Fix greyscale PIL images
Move import files into input module inside io
import_auto is gone
Remove import_auto tests, meshlab method gone
Refactor __init__

Expose input methods from input folder
Fix relative imports

I messed up the style, reverting them here
More relative import fixes in io
Add the landmark and image exporters

Fairly simple, just follows the import style. Supports file
handles as well as strings.

Currently we can export all PIL types and LJSON and PTS style
landmarks.
Rename IO tests to import io tests
Refactor out extension checking
Expose the exporters

Also, add lots of tests to make sure that I've been doing sensible
things!
Missing documentation
Whitespace fixes

@jabooth was offended by header string for PTS (which was split
to make it clear what it looked like) so I changed them for new
lines
Swap fp and object

Rename filepath to fp, as per @jabooth request
Comment exporter functions
Blank lines