Update README.md
initial conversion of api to south management
copy of filterlistitem
make filterlistitem abstract
Merge pull request #24 from amyxzhang/7-south-migration

7 south migration
no duplicates allowed, set blank and null defaults
add setup_django script and script to remove duplicate filterlistitems. can run this script in shell
set south schema migration
Merge pull request #25 from amyxzhang/3-no-duplicate-wblistitems

3 no duplicate wblistitems
remove redundant field and alter uniqueness constraint
remove bug and unnecessary field
south scripts for migrating db changes