Show formatted numbers in the paging when over 1,000 pages

[mgpGit-zz]

Angular version:
5.2.11

ngx-pagination version:
3.2.1

Description of issue:
The paging numbers do not have commas in it when the number of pages go past 1,000.
So the number displays as 4300 instead of 4,300.
(We use Server-Side Paging in our app so the number of pages can be large)

Steps to reproduce:
Set the totalItems to be a large number like 20,000 and make the itemsPerPage to be 5.

Expected result:
Show commas in the button page links for easy reading

Actual result:
The pages displayed in the button selection will not have commas in the number.

Demo:
Here is a demo
https://angular-upmtxc.stackblitz.io

Any relevant code:

[michaelbromley]

This would be a good enhancement. It could be done with the the built-n Angular number pipe in this part of the template.

I've not got time to do this right now, but I'll mark it as a good first issue and see if anyone wants to tackle it before I get round to it.

In the meantime if you really need this formatting right now, you'd have to use a custom template.

[michaelbromley]

Fixed by #309