[RxJS] Add debug method to Observable in TypeScript

Observable.prototype.debug = function(message: any) {
return this.do(
(next) => {
if(!environment.production) {
console.log(message, next);
}
},
(err) => {
if(!environment.production) {
console.error(message, err)
}
},
() => {
if(!environment.production) {
console.info("Observable completed", message)
}
}
);
};declare module 'rxjs/observable' {
interface Observable<T> {
debug: (...any) => Observable<T>
}
}