Fixed a bug whereby the scope of metadata queries was not restricted
by a collection path if that path was provided under the short form of
the JSON collection key ("coll", instead of "collection").

Fixed a test bug in the timestamp query tests (GE test was substituted
by LE). The test should not have been passing, yet it was.
Merge pull request #78 from keithj/devel

Fixed a bug in restricting the scope of metadata queries