Add include for .hrl

Author: crownedgrouse

src/jason.hrl

@@ -0,0 +1,7 @@
+-record(opt, {nl      = []     :: list()
+             ,indent  = false
+             ,records = []     :: list()
+             ,mode    = struct :: atom()
+             ,binary  = undefined :: atom()
+             ,aliases = []     :: list()
+             }).