Update README

- Correct installation instructions and settings
- Add details of example transactions

Fixes #15
Add include_package_data=True to setup.py

This allows templates to be picked up in the packaging.

Fixes #16, #17
Add migrate to make sandbox
Tweak dashboard templates

- Select2 was doing annoying things with the select inputs that were
  hidden.  This needs fixing in Oscar.

- Some whitespace issues in the account search form.
Bump version to 0.3, add CHANGELOG
Update screenshots
Fix typo in sample code