feat(PostRender): use postRender to render an Angular Component, closes #7

[ghiscoding]

• this feature kinda simulate a Formatter with an Angular Component but has some slight delay in rendering the content, that is because Angular requires at least 1 cycle to render it's own component and cannot output a string right (which SlickGrid Formatter requires to work).

this closes issue #7

I reopened the issue as this will be possible with this PR,, however there are limitation. This is doable via asyncPostRender (with enableAsyncPostRender) but this is an async function in SlickGrid and this works fine but we can visually see the data being change. So basically, we cannot use a Formatter because Angular Component needs at least 1 cycle before the Angular Component is rendered properly and SlickGrid Formatter requires string right away, so we cannot use Formatter for that reason.

Here's a SlickGrid PostRender demo and here's an animated gif of an Angular Component using the postRender. While I scroll up down, you can visually see a slight delay in rendering the content of that cell (the bold text, 3rd column)... but hey it's works and it might useful for some.