* erasure-coding block data
* adjust error handling
* merkleize chunks and yield branches for each
* construction and proving of merkle branches
* port over to new GF(2^16) impl
* some tests for wrapped_shard
* handle extra byte from GF(2^16) better
* point to github dependency
* add issue link
* point to master for reed-solomon-erasure
* add missing license header
Robert Habermeier