Added SetTimeout to Connection in the .NET client

The SetTimeout method takes a delay and an operation.
It returns an IDisposable that will cancel the operation if
disposed before the delay is up.

SetTimeout is used to schedule a switch to the disconnect
state in the even the client is unable to quickly reconnect.

Added Stop and Start functionality to Connection Status sample to tes…

…t the fix for SignalR#925

- We don't currently have integration tests for JavaScript so the next
best method for ensuring no regression was to modify the sample.

Added an activated flag to the keep alive to account for cases when t…

…he keep alive is set to null

SignalR#840

Build changes

 - Don't build docs for normal build
 - Fix build versioning
 - Delete build folder before build

Updated release notes for 0.5.2

Fixed connect event ordering issue in JS.

Updated JS version number to 0.5.1

Don't rev the package version per ci build number.

Don't rev the package version per ci build number.

Include owin in packages.

Updated relese notes