Full restructure in accordance with

- pkg/{subsystem}/{package} style
  - modify Makefile to reflect the new style,
    consolidate various entries
  - add a dummy ``main.go`` at top level

pkg/storage/erasure/doc.go

@@ -0,0 +1,47 @@
+// Package erasure is a Go wrapper for the Intel Intelligent Storage
+// Acceleration Library (Intel ISA-L).  Intel ISA-L is a CPU optimized
+// implementation of erasure code.
+//
+// For more information on Intel ISA-L, please visit:
+// https://01.org/intel%C2%AE-storage-acceleration-library-open-source-version
+//
+// Usage
+//
+// TODO: Explain Encode and Decode inputs and outputs
+//
+// TODO: Explain matrix size and how it corresponds to protection level
+//
+// Encoding data may be performed in 3 steps.
+//
+//  1. Create a parse set of encoder parameters
+//  2. Create a new encoder
+//  3. Encode data
+//
+// Decoding data is also performed in 3 steps.
+//
+//  1. Create a parse set of encoder parameters for validation
+//  2. Create a new encoder
+//  3. Decode data
+//
+// Encoder parameters contain four configurable elements:
+//  ParseEncoderParams(k, m, technique int) (EncoderParams, error)
+//  k - Number of rows in matrix
+//  m - Number of colums in matrix
+//  technique - Matrix type, can be either CAUCHY (recommended) or VANDERMONDE
+//  constraints: k + m < Galois Field (2^8)
+//
+// Example
+//
+// Creating and using an encoder
+//  var bytes []byte
+//  params := erasure.ParseEncoderParams(10, 5, erasure.CAUCHY)
+//  encoder := erasure.NewEncoder(params)
+//  encodedData, length := encoder.Encode(bytes)
+//
+// Creating and using a decoder
+//  var encodedData [][]byte
+//  var length int
+//  params := erasure.ParseEncoderParams(10, 5, erasure.CAUCHY)
+//  encoder := erasure.NewEncoder(params)
+//  originalData, err := encoder.Decode(encodedData, length)
+package erasure