Add HPACK test cases

fixtures/hpack/go-hpack/story_00.json

@@ -0,0 +1,62 @@
+{
+  "description": "https://github.com/Jxck/hpack implemeted in Golang. Encoded using String Literal with Huffman, no Header/Static Table, and always start with emptied Reference Set. by Jxck.",
+  "cases": [
+    {
+      "seqno": 0,
+      "header_table_size": 4096,
+      "wire": "0085b9495339e483c5837f0085b8824e5a4b839d29af0088b83b5339ec327d7f88f439ce75c875fa570084b958d33f8163",
+      "headers": [
+        {
+          ":method": "GET"
+        },
+        {
+          ":scheme": "http"
+        },
+        {
+          ":authority": "yahoo.co.jp"
+        },
+        {
+          ":path": "/"
+        }
+      ]
+    },
+    {
+      "seqno": 1,
+      "header_table_size": 4096,
+      "wire": "0085b9495339e483c5837f0085b8824e5a4b839d29af0088b83b5339ec327d7f8cf1e3c2fe8739ceb90ebf4aff0084b958d33f8163",
+      "headers": [
+        {
+          ":method": "GET"
+        },
+        {
+          ":scheme": "http"
+        },
+        {
+          ":authority": "www.yahoo.co.jp"
+        },
+        {
+          ":path": "/"
+        }
+      ]
+    },
+    {
+      "seqno": 2,
+      "header_table_size": 4096,
+      "wire": "0085b9495339e483c5837f0085b8824e5a4b839d29af0088b83b5339ec327d7f87eabfa35332fd2b0084b958d33f9b60d48e62a1849eb611589825353141e63ad52160b206c4f2f5d537",
+      "headers": [
+        {
+          ":method": "GET"
+        },
+        {
+          ":scheme": "http"
+        },
+        {
+          ":authority": "k.yimg.jp"
+        },
+        {
+          ":path": "/images/top/sp2/cmn/logo-ns-130528.png"
+        }
+      ]
+    }
+  ]
+}