remove unnecessary comments
Fix DebugCounter related things in core.web. Other misc optimizations in core.web.
Add 'json' to the DeviceManager's REST API to be consistent with the rest. Ending the path in a / is bad REST practice.
Use /wm/device/all/json for all devices and /*** where *** is a filter by mac, vlan, ip, etc
Changed DebugCounterServiceImpl's registerCounter(). It turns out we do need to always return a reference to an IDebugCounter. If the counter we're trying to add is already there, return the existing IDebugCounter, else if the counter is not there, add it, and return it instead.