implemented several of the fixes suggested by the travic bot on "child-process-promise"'s definition file
implemented several of the fixes suggested by the travic bot on "child-process-promise"'s definition file

mcliment/DefinitelyTyped,borisyankov/DefinitelyTyped,dsebastien/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,georgemarshall/DefinitelyTyped,borisyankov/DefinitelyTyped,markogresak/DefinitelyTyped,dsebastien/DefinitelyTyped