Merge pull request #366 from slapresta/inversed-contains

Added `in` command

builtin.c

@@ -1121,6 +1121,8 @@ static const char* const jq_builtins[] = {
   "  | reduce range(0; $max) as $j"
   "      ([]; . + [reduce range(0;$length) as $i ([]; . + [ $in[$i][$j] ] )] )"
 	      "  end;",
+  "def in(xs): . as $x | xs | has($x)",
+  "def inside(xs): . as $x | xs | contains($x)",
 };
 #undef LIBM_DD