Updated scripts
Fixed potential memory leak in TransportHeartBeat.
- End the connection before removing it from the list in when the server command
  is received so that the subscription is cleaned up.

#1953
Added state tracking to transports.
- Added flags enum to show state transition history
  of a transport. This will make dumps much easier to
  analyze as we'll have more historical data.
Added more states for tracking.
Changed Initialized to None.
Made changes to the .NET client to use 2 Http Clients

- Removed the check for the WebRequestCreator type for determining if the platform is SL
#1908
Made changes as per code review feedback

#1908
Made changes as per code review feedback

#1908
Made changes to StressRun because of changes in IHttpClient

#1908
Use the closest mapping in the store when there's gaps.
- Pick the first element in the fragment bigger than
  requested mapping id when failing to find the element.
- Added unit tests.

#1973
Merge branch 'release' into dev

Conflicts:
	samples/Microsoft.AspNet.SignalR.Hosting.AspNet.Samples/Scripts/jquery.signalR.min.js
	samples/Microsoft.AspNet.SignalR.LoadTestHarness/Scripts/jquery.signalR.min.js
Support custom json object in JS client
- Added connection.prototype.json which is initialized as window.JSON
- Changed default ajax content type to text
- Added connection._parseRespons helper to parse ajax responses from text to JSON (when it's not JSONP)
- Update all JS client code to use connection._parseResponse
- Added unit & functional tests
- Updated affected tests
- #1564
Code review feedback for JS client custom JSON:
- Change use of "self" to "that" in JS client
- Added unit test to ensure custom JSON object is unique (not shared)
- Corrected places where it was not calling into the helper method
Run JS client JSON unit test for connection & hubConnection
Fix JsonFacts.js test
===
Skip tests and codeanalysis for private runs
Add end to end performance test to stress.
Made changes to .NET4 and WebSockets to allow setting of certs, proxies, cookies and creds

- Fixed code analysis
#1908
Made changes as per code review feedback

#1908