\QueryPath\QueryPath class doesn't exists.

The class QueryPath is not contained in the QueryPath namespace so the full name of the QueryPath class is \QueryPath and not \QueryPath\QueryPath making the first `if` to be always true
Merge pull request #119 from Faryshta/patch-1

\QueryPath\QueryPath class doesn't exists.
Merge branch 'master' of github.com:technosophos/querypath into 3.x
Updated RELEASE and CREDITS for #119.