Update to new HttpClient

[fmalcher]

With Angular 5.0.0 released we should finally go with the new HttpClient API.
This PR also brings

• some interfaces for the HTTP responses
• updated rollup config
• some formatting stuff

TODO:
Update and re-generate docs

[ima-tech]

Any updates on the merge status for this? Thank you!

[Swissbite]

@fmalcher Could you also update the angular dependencies so that angular 5 is supported?

[fmalcher]

@Swissbite What you you (and others) think would be appropriate settings there?

Suggestion:

"peerDependencies": {
    "@angular/core": ">=4.3.0",
    "@angular/common": ">=4.3.0",
    "rxjs": ">=5.1.0",
    "zone.js": ">=0.8.4"
  }

//cc @manfredsteyer

[Swissbite]

@fmalcher Is it only depending on @angular/core and @angular/common in the angular universe?

Another suggestion to ensure that it will not accidently break with angular 6:

"peerDependencies": {
    "@angular/core": ">=4.3.0 <6.0.0",
    "@angular/common": ">=4.3.0<6.0.0",
    "rxjs": ">=5.1.0",
    "zone.js": ">=0.8.4"
  }

[manfredsteyer]

thx

[Gaiidenn]

Hi here, thanks for this great update!
Any idea when this patch will be available through NPM ?

[Gaiidenn]

Ok it's done, ty :)