Indy requires keys to be tuple. So memcache keys are a one-tuple of a string, rather than just a string.
Have to explicitly pass the arena to Indy::TKey's constructor

Otherwise we pass into a constructor where it never gets set

TODO: That shouldn't be possible.
Memcache keys are stored effectively as two-tuples of {flag, value}

We now do this as well. Also fix some protocol correctness errors
 - Set wasn't storing the flags
 - Set wasn't checking expiration
 - Get wasn't reading out the flags
 - Get expected the request to have 4 bytes of extras for flags
Teach Tetris that Mynde is a very special case

It isn't a stig package, so we need to hand-code the bits which it
normally would call into a package for.
Better formatting
Add a little internal logging. Use more clear function calls (Even though it is redundant work)
Add sample of calling Mynde from python
Merge pull request #186 from cmaloney/mynde_bugfixes

Mynde bugfixes