Bug 878084 - part 1 - move TelemetryPing to a common global variable for telemetry tests; r=vladan
Bug 878084 - part 2 - delete BinaryInputStream constructor definition in telemetry tests; r=vladan
Bug 878084 - part 3 - factor out registering ping handlers to a common function; r=vladan
Bug 878084 - part 4 - make telemetry tests submit to a URL with a more realistic path; r=vladan
Bug 877706 - fix unused variable warning in PerfSpewer.cpp; r=nmatsakis