Allow deferred configuring

[un-def]

It seems like NgxMetrikaService.configure() could be used for deferred configuring but it does not actually work that way:

// app.module.ts

@NgModule({
  imports: [
    ...
    // Omit config parameter and configure later
    NgxMetrikaModule.forRoot(),
  ]
})

// app.component.ts

export class AppComponent implements OnInit {

  constructor(
    private ym: NgxMetrikaService,
    // Backend API service
    private api: MyApiService,
  ) {}

    ngOnInit() {
      // Fetch the config from the server and configure metrika
      // MyApiService.getYandexMetrikaConfig() returns the following object:
      // { id: ..., defer: true, webvisor: true, clickmap: true }
      this.api.getYandexMetrikaConfig().subscribe(config => this.ym.configure(config));
    }

The example above doesn't work properly due to following reasons:

1. configure() does not set default parameters (triggerEvent: true, trackPageViews: true) as the constructor does. You should set them explicitly in the config object.
2. configure() does not set this.config but onHit() and onReachGoal() need it.

I've done slight refactoring in this PR, so it is now possible to configure NgxMetrikaService as in the example above.

[kolkov]

Hi! I moved lib files to separate project. Update PR please.

[codecov-io]

Codecov Report

Merging #2 into master will not change coverage. The diff coverage is 75%.

@@           Coverage Diff           @@
##           master       #2   +/-   ##
=======================================
  Coverage   47.14%   47.14%           
=======================================
  Files           3        3           
  Lines          70       70           
  Branches        9        9           
=======================================
  Hits           33       33           
  Misses         34       34           
  Partials        3        3

Impacted Files	Coverage Δ
.../kolkov/ngx-metrika/src/lib/ngx-metrika.service.ts	43.93% <75%> (ø)	:arrow_up:

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[un-def]

Done.

[kolkov]

Thanks!

[kolkov]

I was change folder structure after merge, check please.

[un-def]

Unfortunately, I no longer have access to the project where this library has been used, therefore I cannot recheck the library code again. But since you just moved/renamed a directory, it doesn't seem to be a problem.

[kolkov]

Hi! Thanks for your response! No problem.)