implemented reporting of profiler data via scribe
the default value for now is false
make sure wfWikiID() is available
refactored the code a bit and introduced profiler sinks
cleaned up ProfilerSimpleUDP.php
cleaned up ProfilerXhprof.php
small cleanup in Profiler:getCpuTime()
small cleanup in Profiler::getProfileID()
reverted rename of
keep the old UDP stream of Mediawiki profiler along with the new scribe stream
make scribe stream a new default reporting channel for profiler data
Merge branch 'dev' into transaction-tracer-profilers

Conflicts:
	includes/wikia/DefaultSettings.php
Merge pull request #4087 from Wikia/transaction-tracer-profilers

implemented reporting of profiler data via scribe