[sql]rename original files to replace . with _ in file name. this solves the problem during loaddata
[readme] update the readme to make the database setup more clear

1. list postgressql in PREREQUISITES
2. make it clear that the database 'pod_brand' and role 'pod' should be created before syncdb
3. use 'python manage.py syncdb --migrate' instead of just 'python manage.py syncdb'
4. reflect the rename of dumped data
Merge branch 'master' of https://github.com/Feng-Gao/brand-manager

* 'master' of https://github.com/Feng-Gao/brand-manager: (28 commits)
  Fixing design
  Changing indentation for footer
  Removing tabulation.
  base changed
  More django-compressor configuration and fixing template
  Re-adding COMPRESS_STORAGE
  Adding CACHEFILES_STORAGE for later sorl_thumbnail usage
  Fixing configuration for COMPRESS_URL
  Adding administrator address to get the error tracebacks.
  Add content div
  Changing the COMPRESS_STORAGE
  Footer OKFN
  Configuring S3 django-compressor cache URL
  Adding compressor for CSS to convert STATIC_URL in them.
  update css file
  Configuration for collecting static files in development environment.
  Adding static directory for collecting static files in development environment
  Adding server sending address
  Adding sendgrid email configuration for Heroku
  Fixing assets path
  ...