Change long polling request to use same URL and POST instead of GET

- Update client protocol
- This change is intended to avoid a memory leak in IE/Chrome

#2953
Stop using the PreserveCultureAwaiter in MessageBroker and Subscription
Remove resource string in trace message

#2920
UntilServerDoUsApart - implementing logic for starting WebSocket transport on WindowsPhone 8.1.
BetterPath - updating path to MSBuild to use v12 required to build Windows Store projects.
Getting SimpleEchoHub to work on perf-teamcity with HttpListener
Added HttpListener implementation for Stress version of CreateTestHost
Adding SendReceiveRun back into performance tests, added http get/post to Owin host
Added MessageBusRun back into stress run
Added MessageBusRun back into solution, using global resolver to avoid multiple instances
Commit to trigger another teamcity build.
Fixing OwinTestHost for HubInvocationRun
Added RedisMessageBusTest back into TPlan
Getting SendReceive test to produce full perf counter data
Testing copy step outside of xml config
Triggering another build
Triggering yet another build
Triggering yet another build again.
Reverting to previous file copy method
Uncommenting WWW copy command