Update README.md
Refactored.  Add wrapper to pure Go leveldb implementation.
Refactoring.  Setup mechanism for data type registration using system similar to image package.
Modify documentation to better fit godoc.org and other automated extraction
Fix documentation
Slight adjustment of doc.go's to see impact on summaries
Allow specification of datastore directory rather than current dir.
Implement data-specific 'add' support and data type Service interface
Major refactoring.  Still bit more to go on server side and wrapping up rpc connection
More refactoring.  Working rpc & http server but no command support but 'types'
Added delegation to data type-specific commands
Refine help system both locally and on server-side
Refactor command implementation and add support for send input and output data.
Change 'add' to 'server_load' to reflect remote load vs sending local data via rpc. Minor mods
Now save datastore configuration and UUID list in datastore, and allow interactive specification of configuration on 'init'
Refactored.  Added simple spatial indexing scheme (ZXY).  Added block cache system.
Move dvid command into root dir and common.go into dvid/ subdir for better documentation flow
Add nicer printing of SpatialIndex
Add concurrent block handlers that solve sync issues on partial updates of blocks.  Assumes leveldb cache will handle frequent re-get and re-put of blocks.
Refactored a bit.  Make datastore.Datatype elements private