Implemented the south_triple_field to add support for south migration again.

After the PR #17, south was not working anymore. Now it works.
Merge pull request #18 from ssouk/fixing_south_migration_support

Implemented the south_triple_field to re-add support for south migration
pep8 clean up
Returning the right default for south.

We have a tricky situation here. If we want the default for the class,
it should be of the form '0.0 GBP', however, if we want the default
for south (which calls the field.get_default() method), we need to
store only the numerical value 0.0

So this offer this ability, using introspect to understand if the call
comes from south and act appropriately.
Merge pull request #19 from ssouk/returning_the_right_default_for_south

Returning the right default for south.
Django 1.5 compatibility fix
Merge pull request #20 from devlocal/master

Django 1.5 compatibility fix
bumped to version 0.3.3
added maintainer info to setup to remove warnings
make djmoney importable by Django 1.3 projects
Merge pull request #21 from sorcio/master

Make djmoney importable from Django 1.3 projects