feeds_xpathparser 6.x-1.9

This is a big release. Let's see...

• We now have a built-in query debugger so that you can see the results of misbehaving queries.
• There is now variable substitution support, more documentation to come, but it's awesome. Thanks to dhcole for the inspiration.
• Warning and error messages can be turned on and off.
• The bad old regex for parsing queries and adding the default namespace is no more. Now we have an actual parser. It has tests!
• #928846: Fatal error: Unsupported operand type by moondancerjen,CrackWilding,twistor: Fixed Fatal error: Unsupported operand type.
• #865352: Feeds XPath Parser: More detailed error messges by iantresman: Changed Feeds XPath Parser: More detailed error messges.
• #933984: Textfields on import form only allow 60 characters by joshuajabbour: Fixed Textfields on import form only allow 60 characters.
• #870222: If field does not exist pass a "NA" or NULL value. by nfd, gthoele: Fixed If field does not exist pass a 'NA' or NULL value. Also added a new XPath expression parser.