First alpha release of stasher, a python-based Kademlia DHT implementation

specifically created for I2P.

New Files:
 - aum.stasher - a single noderef
 - stasher - wrapper script for starting/stopping/using stasher
 - stasher.py - similar wrapper script for 'doze users
 - src/bencode.py - requisite module
 - src/i2p/stasher.py - the stasher application classes - python module

Modified Files:
 - setup.py - added code to install stasher wrapper
 - src/i2p/__init__.py - added stasher to '__all__', allowing import