Add erasure coding and decoding using Intel Storage Acceleration library

- move contrib/erasure --> contrib/isal
 - bring in low level 'isal' package for Go for exposing C functions
 - Implement Erasure 'encoding'
   Supports - Reed Solomon Codes, Cauchy Codes
 - Implement Erasure 'decoding'
   Supports - Reed Solomon Codes, Cauchy Codes
 - Renames Minios -> Minio at all the references

erasure/Makefile

@@ -0,0 +1,16 @@
+all: build test
+.PHONY: all
+
+test: cauchy vandermonde
+
+cauchy:
+	@go test -test.run="TestCauchy*"
+
+vandermonde:
+	@go test -test.run="TestVanderMonde*"
+
+isal/isal-l.so:
+	@$(MAKE) --quiet -C isal
+
+build: isal/isal-l.so
+	@go build