fix typo
simplify comparisons and remove default value from dict.get method call
pep8, remove unused import
use currency_field_name to get field name
rename currency_field_name and move it to utils
fix
Merge branch 'cleanup' of git://github.com/Stranger6667/django-money into Stranger6667-cleanup

Conflicts:
	djmoney/models/fields.py
	djmoney/models/managers.py
	djmoney/tests/model_tests.py