feat(html-content): templates by type

Alternative for PR #63

What kind of change does this PR introduce? Close: https://github.com/akserg/ng2-toasty/issues/3
What is the current behavior? (You can also link to an open issue here) Not supporting 'html' content in toasts
What is the new behavior (if this is a feature change)? Supporting ability to projecting 'html' templates in toasts
Other information: Testings using this branch: ng2-webpack-demo/toasty-html-content

Using that code:

<ng2-toasty [position]="toastyComponentPosition">
  <template toastyTitleTemplate let-toast>
    HTML title: <span style="background-color: #1EAEDB; color: #E1CB00;">{{toast.title}}</span>
  </template>
  <template toastyMessageTemplate let-toast>
    HTML message: <span style="background-color: #ff0039; color: #00e104;">{{toast.msg}}</span>
  </template>
</ng2-toasty>

Gives the result: toasty-html-content-demo

I would happy to review and discussing

akserg / ng2-toasty

feat(html-content): templates by type #64