ShellCommandWatchdog - update the watchdog 'feed' value on update command.
Support HTTP 1.0 action invocations which don't include a Content-Length header.  Also add hacky support for chunked 1.1 requests
Merge branch 'master' of ssh://core.linn.co.uk/home/git/ohnet
Added nodeUdn variable to example js binding
ProxyError is now derived from OpenHome::Exception.

Supported by THROW_PROXYERROR macro, and templates updated.
Add non-fatal stacktrace logging function for exceptions.

Exploit this function in Shell class.
Default behaviour of tests is to exit(1) on failure.

Otherwise controllable by ABORT_ON_FAILURE env var.