Vishnu

**Additions and Improvements**
- Vishnu is now compatible with any WSGI application!
- Improved session configuration
- Support for multiple backends
- GAE memcache
- GAE NDB
- `pymemcache`
- `python-memcached`
- `redis`
- More extensive unit testing

**Fixes**
- Fixes bug where terminating and starting a session within same request fails to send cookie 16

**Fixes**
- Fixes expires field not being sent down for persisted sessions

**Changes**
- Support for publishing to PyPI
- Adds pycrypto requirement
- Converts README to restructured text
- Unit testing for Cipher

**Fixes**
- Minor code cleanup
- Adds version to `__init__.py`

**Fixes**
- fixes session attempting to save empty data after it has been terminated 14

Initial release.

**Features**
- Cookie based session for Google App Engine using the NDB datastore
- Configurable for the following cookie settings:
- Domain
- Path
- Secure
- HttpOnly
- Expires (timeout)
- HMAC signature to verify cookie has not been tampered
- Autosave option which saves anytime a session value is modified
- Optional Encryption of cookie data using AES
- Custom timeout per session