Remove common_currency model entirely

- A lot of views / pages / etc needed to be updated too
- Now uses django-money fields entirely
- Create a manual rate exchange backend (needs more work!)

InvenTree/common/api.py

@@ -5,35 +5,5 @@ Provides a JSON API for common components.
 # -*- coding: utf-8 -*-
 from __future__ import unicode_literals
 
-from rest_framework import permissions, generics, filters
-
-from django.conf.urls import url
-
-from .models import Currency
-from .serializers import CurrencySerializer
-
-
-class CurrencyList(generics.ListCreateAPIView):
-    """ API endpoint for accessing a list of Currency objects.
-
-    - GET: Return a list of Currencies
-    - POST: Create a new currency
-    """
-
-    queryset = Currency.objects.all()
-    serializer_class = CurrencySerializer
-
-    permission_classes = [
-        permissions.IsAuthenticated,
-    ]
-
-    filter_backends = [
-        filters.OrderingFilter,
-    ]
-
-    ordering_fields = ['suffix', 'value']
-
-
 common_api_urls = [
-    url(r'^currency/?$', CurrencyList.as_view(), name='api-currency-list'),
 ]