Added property for query string parameters

Property qs for SignalR connection could be used to pass additional parameters to new SignalR persistent/hub connections. It is available since 1.0 and is present in 2.0 version of SignalR
Fixed some typings with the chain syntax
Merge pull request #1580 from kant2002/master

Added property for query string parameters
Underscore: Used tabs vs spaces for my additions

and added explanation in test
Merge branch 'master' of https://github.com/borisyankov/DefinitelyTyped.git
es6-promises fix whitespace + argument names consistent with http://promises-aplus.github.io/promises-spec/
Merge pull request #1581 from tandyjames/master

Fixed some typings with the chain syntax - includes workaround for bug in TS 0.9.5.  Workaround will be removed when TS bug fix ships.