Added .dir-locals.el for development.

Converted from Eclipse to python-django.el, storing local variables here!
urls.defaults is deprecated, use urls instead.

Replaced urls.defaults with urls since the former is now deprecated.
url requires a non-empty first argument.

Wrapped all first arguments to url with single quotes.
Updated requirements.txt

Removed all other requirements, added only what was needed to run.
Continuing tests to determine whether anything essential was left out.
Merge branch 'feature/support-django-1.5' into develop
Reordered and shortened inventory references.  Fixes #14.

Instead of saying "Bin 4 on Shelf 3 in Row 2 in Warehouse 1", we now
say "W1R2S3B4".  Crates are similarly shortened.
Added new management command 'crate_utilization'.  Implements #15, references #14.

Changed the inventory model to have 'long name' and 'short name'
values.  The crate utilization command uses the long names, as does
the admin site.  The short names will be handy for barcoding.

The crate utilization command takes one argument (the number of the
warehouse in question) and two options: --full to include full crates
and --empty to include empty crates.  The command generates a table
listing all crates neither empty nor full (unless the respective
options are enabled) ordered least full to most full.