Emit event when datatable was created; That needed in other parent directives for example;

Hi!

I forked your repository for adding small feature. I suggest throwing event with table Id when dataTable was created. It gives a lot of help for tracking it in another directive. It needed to predefine some columns and options which I will use for many tables.

For example:

I created some directive with template:

`<table class="jq-table table table-bordered table-striped" datatable dt-options="tableOptions" dt-columns="tableColumns"></table>`

And I would like to get access to dataTable element. With that event I can get table element by Id from event arguments.

If you accept my changes, Can you increase version of your release, please?

Many thanks!

___________
Regards, Ivan