moved opts record def from jsx_common.hrl to a public jsx.hrl header file

actually included the new header, oops

src/jsx_common.hrl

@@ -1,9 +1,3 @@
--record(opts, {
-    comments = false,
-    escaped_unicode = ascii,
-    naked_values = false
-}).
-
 %% whitespace
 -define(space, 16#20).
 -define(tab, 16#09).

src/jsx_utf8.erl

@@ -3,6 +3,7 @@
 -export([start/4]).
 
 -include("jsx_common.hrl").
+-include("../include/jsx.hrl").
 
 callback(eof, Callbacks) ->
     lists:reverse(Callbacks);