Fixed problem with using interceptor with localStorage

[PiosDamian]

fixed problem #255

[GFoley83]

Would this be better suited as a property?

public get storage() : OAuthStorage {
   return this._storage;
}

[PiosDamian]

maybe, but setStorage is used as method
that's why i also use it like this

[manfredsteyer]

Thanks for your effort. I guess your solution could cause cycles:

HttpClient --> Interceptor --> OAuthService
      ^                                  |
      +----------------------------------+