Publish ClientSession.loop property

[asvetlov]

web.Application.loop is very handy -- all server code has access to application instance and therefore loop is not need to be tediously passed into every function call.

Let's implement the same for client session.

[Kentzo]

@asvetlov I think this feature request may be related to this task: http://bugs.python.org/issue26969

[asvetlov]

No. I recommend to pass loop explicitly everywhere.
The property is just convenient helper allowing to not pass loop along with ClientSession because the session already has a reference to loop inside.

[lock]

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