mod_encode_decode and mod_imgtools update

Modified the file structure to use an /images/ directory instead of just
the root directory. Cleans things up a bit.
Draft experiment

Converted test.py into run_expt.py, which now exports data from the
encoding and decoding process to a file in the /data/ folder.
mod_imgtools release

Initial release, included are Pillow 2.3.0 and two calibration images.
Merge pull request #7 from Driminary/development

Development