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fixes an issue where angular's JiT compiler will generate null values where ngrx/store was expecting undefined.

Adds support for Angular2 RC5 and App Modules.

• BREAKING CHANGE: users should import {StoreModule, Store} from '@ngrx/store' and provide the store as follows:

import {StoreModule, Store} from '@ngrx/store'
import {NgModule} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'

@NgModule({
  imports: [
    BrowserModule,
    StoreModule.provideStore(reducer, initialState)
  ]
})