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/matrix_decode.h

@@ -0,0 +1,24 @@
+/*
+ * Mini Object Storage, (C) 2014 Minio, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef __MATRIX_DECODE_H__
+#define __MATRIX_DECODE_H__
+
+int gf_gen_decode_matrix (int *src_err_list,
+                          unsigned char *encoding_matrix,
+                          unsigned char *decode_matrix, int k, int n,
+                          int errs, size_t matrix_size);
+#endif /* __MATRIX_DECODE_H__  */