- added Widget and forms.VersionField tests
- added ConcurrencyMiddleware
- bug fixes
- added middleware tests
code clean
updated .gitignore
ops... mistake in __repr__ of VersionField
new CONCURRECY_SANITY_CHECK settings
send 'got_request_exception' signal in middleware
- code clean and typos
- removed no-API ConcurrentModelAdmin
- 0.4c4