allow blank values in BaseEncryptedNumberField
PEP8 fixes
add block_type to the south introspection rules
fix multiple object failure, plus a test to prove it.
add block_type to the south introspection rules

Conflicts:
	src/django_fields/fields.py
add block_type to the south introspection rules

Conflicts:
	src/django_fields/fields.py
fix multiple object failure, plus a test to prove it.
fix multiple object failure, plus a test to prove it.
Merge branch 'multisave' of github.com:defrex/django-fields into multisave

Conflicts:
	src/django_fields/tests.py
Merge branch 'multisave'

Conflicts:
	src/django_fields/tests.py
Merge branch 'south'
Merge pull request #32 from defrex/master

Allow Django Admin to initialize blank number fields, fix multiple object failure (with tests), and add south introspection rules for new fields introduced in previous release. (includes pull requests #33 and #34).
Updating version to 0.2.2, with ChangeLog update.