Metacat

Add the debug statement.

refactor to use D1RestServlet and D1ResourceHandler for the D1 rest interface

make RestServlet and ResourceHandler extendible for D1 CN and MN handlers

implemented describeObject

Merging in REST interface implementation that was created by Serhan Akin. Main change is
a refactored MetaCatServlet.java class, in which all of the handle* methods were moved
into a separate MetacatHandler.java class. This allows both the standard MetaCatServlet...