Removed Parentheses from the half escape list

Parentheses don't need to be escaped as they are used as grouping modifiers.
Tested in Sphinx 2.0.8
Removed unneeded escape causing match parser errors

Removed the extra escape which was double escaping the escape slash from half escape causing parser errors from searched
Added ability to not quote order by items

As of Sphinx 2.0.8 RAND() can now be used in the order by clause.
Added option to not quote attribute in order by therefore allowing new functionality