Code cleanup: Simplify assertRuntimeBind test utility

In #436, @jzaefferer said the below. The goal of this issue is following-up with this change.

> Actually, this allows a custom tests to be performed by each calling code. For example: https://github.com/jquery/globalize/pull/436/files#diff-9ee4a6f38e08bc680f4668d25dedaff8R30, https://github.com/jquery/globalize/pull/436/files#diff-3b257e2c8b293a57b0336b413514f034R110. Please, just let me know if I misinterpreted your comment.

Its called synchronously with an argument passed by the caller. Thats trivial to do without the callback. From test/functional/number/number-formatter.js:

``` js
util.assertRuntimeBind(
assert,
Globalize.numberFormatter(),
"b468386326",
"Globalize(\"en\").numberFormatter({})",
function( runtimeArgs ) {
assert.equal( JSON.stringify( runtimeArgs[ 0 ] ), "[\"\",null,1,0,3,null,null," +
"null,3,null,\"\",\"#,##0.###\",\"-#,##0.###\",\"-\",\"\",null,\"∞\",\"NaN\",{" +
"\".\":\".\",\",\":\",\",\"%\":\"%\",\"+\":\"+\",\"-\":\"-\",\"E\":\"E\",\"‰\":" +
"\"‰\"},null]"
);
assert.ok( "generatorString" in runtimeArgs[ 0 ][ 15 ] );
assert.equal( runtimeArgs[ 0 ][ 15 ].generatorString(), "numberRound()" );
}
);
```

turns to

``` js
var formatter = Globalize.numberFormatter()
util.assertRuntimeBind( assert, formatter, "b468386326", "Globalize(\"en\").numberFormatter({})" );
assert.equal( JSON.stringify( formatter.runtimeArgs[ 0 ] ), "[\"\",null,1,0,3,null,null," +
"null,3,null,\"\",\"#,##0.###\",\"-#,##0.###\",\"-\",\"\",null,\"∞\",\"NaN\",{" +
"\".\":\".\",\",\":\",\",\"%\":\"%\",\"+\":\"+\",\"-\":\"-\",\"E\":\"E\",\"‰\":" +
"\"‰\"},null]"
);
assert.ok( "generatorString" in formatter.runtimeArgs[ 0 ][ 15 ] );
assert.equal( formatter.runtimeArgs[ 0 ][ 15 ].generatorString(), "numberRound()" );
```

And you can drop the noop function arguments and you get simpler stacktraces.