Added the hash attribute to ints and longs.

FlatBuffer schema files can now optionally specify a hash attribute that
will allow someone writing json files to enter a string to be hashed
rather than a specific value. The hashing algorithm to use is specified
by the schema.

Currently the only algorithms are fnv1 and fnv1a. There are 32 bit and
64 variatns for each. Additionally, a hashing command line tool was
added so that you can see what a string will hash to without needing to
inspect the flatbuffer binary blob.

Change-Id: I0cb359d0e2dc7d2dc1874b446dc19a17cc77109d
diff --git a/tests/monsterdata_test.golden b/tests/monsterdata_test.golden
index a79095a..73afc42 100644
--- a/tests/monsterdata_test.golden
+++ b/tests/monsterdata_test.golden
@@ -36,5 +36,13 @@
   testarrayofstring: [
     "test1",
     "test2"
-  ]
+  ],
+  testhashs32_fnv1: -579221183,
+  testhashu32_fnv1: 3715746113,
+  testhashs64_fnv1: 7930699090847568257,
+  testhashu64_fnv1: 7930699090847568257,
+  testhashs32_fnv1a: -1904106383,
+  testhashu32_fnv1a: 2390860913,
+  testhashs64_fnv1a: 4898026182817603057,
+  testhashu64_fnv1a: 4898026182817603057
 }