Docs: Note on product class as data migration
Docs: Note on product class as data migration

Fixes #495

jmt4/django-oscar,thechampanurag/django-oscar,QLGu/django-oscar,monikasulik/django-oscar,Bogh/django-oscar,manevant/django-oscar,sonofatailor/django-oscar,kapari/django-oscar,jinnykoo/wuyisj.com,Jannes123/django-oscar,anentropic/django-oscar,jlmadurga/django-oscar,jinnykoo/christmas,eddiep1101/django-oscar,ademuk/django-oscar,rocopartners/django-oscar,sonofatailor/django-oscar,josesanch/django-oscar,binarydud/django-oscar,binarydud/django-oscar,thechampanurag/django-oscar,makielab/django-oscar,sasha0/django-oscar,saadatqadri/django-oscar,binarydud/django-oscar,taedori81/django-oscar,WillisXChen/django-oscar,jinnykoo/christmas,adamend/django-oscar,amirrpp/django-oscar,jlmadurga/django-oscar,ademuk/django-oscar,saadatqadri/django-oscar,pasqualguerrero/django-oscar,ka7eh/django-oscar,dongguangming/django-oscar,john-parton/django-oscar,ademuk/django-oscar,bschuon/django-oscar,jinnykoo/wuyisj,dongguangming/django-oscar,machtfit/django-oscar,jmt4/django-oscar,eddiep1101/django-oscar,Bogh/django-oscar,vovanbo/django-oscar,Bogh/django-oscar,django-oscar/django-oscar,solarissmoke/django-oscar,MatthewWilkes/django-oscar,john-parton/django-oscar,ka7eh/django-oscar,WadeYuChen/django-oscar,faratro/django-oscar,saadatqadri/django-oscar,DrOctogon/unwash_ecom,okfish/django-oscar,faratro/django-oscar,faratro/django-oscar,WillisXChen/django-oscar,josesanch/django-oscar,okfish/django-oscar,ahmetdaglarbas/e-commerce,sonofatailor/django-oscar,eddiep1101/django-oscar,solarissmoke/django-oscar,jinnykoo/wuyisj.com,QLGu/django-oscar,jinnykoo/wuyisj.com,jinnykoo/wuyisj,nfletton/django-oscar,machtfit/django-oscar,spartonia/django-oscar,DrOctogon/unwash_ecom,QLGu/django-oscar,itbabu/django-oscar,django-oscar/django-oscar,WillisXChen/django-oscar,Bogh/django-oscar,taedori81/django-oscar,django-oscar/django-oscar,pasqualguerrero/django-oscar,solarissmoke/django-oscar,jlmadurga/django-oscar,marcoantoniooliveira/labweb,bschuon/django-oscar,rocopartners/django-oscar,manevant/django-oscar,lijoantony/django-oscar,ka7eh/django-oscar,monikasulik/django-oscar,sasha0/django-oscar,Jannes123/django-oscar,anentropic/django-oscar,adamend/django-oscar,saadatqadri/django-oscar,michaelkuty/django-oscar,john-parton/django-oscar,pdonadeo/django-oscar,taedori81/django-oscar,WadeYuChen/django-oscar,nickpack/django-oscar,MatthewWilkes/django-oscar,dongguangming/django-oscar,Jannes123/django-oscar,solarissmoke/django-oscar,pasqualguerrero/django-oscar,rocopartners/django-oscar,amirrpp/django-oscar,Idematica/django-oscar,elliotthill/django-oscar,jmt4/django-oscar,anentropic/django-oscar,bnprk/django-oscar,pdonadeo/django-oscar,monikasulik/django-oscar,WadeYuChen/django-oscar,pasqualguerrero/django-oscar,dongguangming/django-oscar,michaelkuty/django-oscar,amirrpp/django-oscar,DrOctogon/unwash_ecom,spartonia/django-oscar,Idematica/django-oscar,machtfit/django-oscar,john-parton/django-oscar,nickpack/django-oscar,thechampanurag/django-oscar,nfletton/django-oscar,nfletton/django-oscar,mexeniz/django-oscar,lijoantony/django-oscar,jmt4/django-oscar,michaelkuty/django-oscar,binarydud/django-oscar,jinnykoo/wuyisj,Idematica/django-oscar,bnprk/django-oscar,michaelkuty/django-oscar,makielab/django-oscar,bschuon/django-oscar,okfish/django-oscar,MatthewWilkes/django-oscar,mexeniz/django-oscar,QLGu/django-oscar,bnprk/django-oscar,makielab/django-oscar,ademuk/django-oscar,ahmetdaglarbas/e-commerce,monikasulik/django-oscar,itbabu/django-oscar,vovanbo/django-oscar,bnprk/django-oscar,kapari/django-oscar,kapt/django-oscar,adamend/django-oscar,Jannes123/django-oscar,spartonia/django-oscar,WadeYuChen/django-oscar,taedori81/django-oscar,marcoantoniooliveira/labweb,ahmetdaglarbas/e-commerce,nfletton/django-oscar,vovanbo/django-oscar,ka7eh/django-oscar,kapari/django-oscar,pdonadeo/django-oscar,spartonia/django-oscar,nickpack/django-oscar,jinnykoo/wuyisj.com,manevant/django-oscar,rocopartners/django-oscar,kapt/django-oscar,eddiep1101/django-oscar,kapari/django-oscar,bschuon/django-oscar,sonofatailor/django-oscar,itbabu/django-oscar,kapt/django-oscar,sasha0/django-oscar,jlmadurga/django-oscar,mexeniz/django-oscar,vovanbo/django-oscar,lijoantony/django-oscar,nickpack/django-oscar,anentropic/django-oscar,manevant/django-oscar,jinnykoo/wuyisj,itbabu/django-oscar,sasha0/django-oscar,okfish/django-oscar,makielab/django-oscar,jinnykoo/christmas,marcoantoniooliveira/labweb,elliotthill/django-oscar,pdonadeo/django-oscar,marcoantoniooliveira/labweb,ahmetdaglarbas/e-commerce,WillisXChen/django-oscar,lijoantony/django-oscar,mexeniz/django-oscar,elliotthill/django-oscar,josesanch/django-oscar,WillisXChen/django-oscar,WillisXChen/django-oscar,thechampanurag/django-oscar,MatthewWilkes/django-oscar,adamend/django-oscar,faratro/django-oscar,django-oscar/django-oscar,amirrpp/django-oscar