fix(inspect): remove inspect and inspectTime operators

Remove inspect and inspectTime operators from this library, since they are unnecessary and don't
exist in previous versions of RxJS.

This change was suggested in issue #1053.

BREAKING CHANGE:
`inspect` and `inspectTime` were removed. Use `withLatestFrom` instead.

Author: staltz

spec/operators/inspect-spec.js

@@ -220,8 +220,6 @@ export class Observable<T> implements CoreOperators<T>  {
                elementSelector?: (value: T) => R,
                durationSelector?: (group: GroupedObservable<R>) => Observable<any>) => Observable<GroupedObservable<R>>;
   ignoreElements: () => Observable<T>;
-  inspect: (notifier: Observable<any>) => Observable<T>;
-  inspectTime: (delay: number, scheduler?: Scheduler) => Observable<T>;
   last: <R>(predicate?: (value: T, index: number) => boolean,
             resultSelector?: (value: T, index: number) => R,
             defaultValue?: any) => Observable<T> | Observable<R>;

spec/operators/inspectTime-spec.js

@@ -11,8 +11,6 @@ export interface KitchenSinkOperators<T> extends CoreOperators<T> {
   distinctUntilKeyChanged?: (key: string, compare?: (x: any, y: any) => boolean) => Observable<T>;
   find?: (predicate: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any) => Observable<T>;
   findIndex?: (predicate: (value: T, index: number, source: Observable<T>) => boolean, thisArg?: any) => Observable<number>;
-  inspect?: (notifier: Observable<any>) => Observable<T>;
-  inspectTime?: (delay: number, scheduler?: IScheduler) => Observable<T>;
   max?: <T, R>(comparer?: (x: R, y: T) => R) => Observable<R>;
   min?: <T, R>(comparer?: (x: R, y: T) => R) => Observable<R>;
   timeInterval?: <T>(scheduler?: IScheduler) => Observable<T>;
@@ -76,8 +74,6 @@ import './add/operator/finally';
 import './add/operator/first';
 import './add/operator/groupBy';
 import './add/operator/ignoreElements';
-import './add/operator/inspect';
-import './add/operator/inspectTime';
 import './add/operator/isEmpty';
 import './add/operator/every';
 import './add/operator/last';