Merge pull request #29 from emmanuelcharon/diffbot-testing

added diffbotHopcount parameter for diffbot crawl and bulk jobs
fix core when top tree's setNumNodes
tried to allocate too many nodes.
fix gbfieldmatch:pageUrl:"http://...." query.
problem with the : in the http:// and problem
with Query.cpp converting pageUrl to lower case
when it was hashed as "pageUrl" in XmlDoc::hashFacet2().