Add option to disable pagination from outside.

[TomaszZieleskiewicz]

I want to use this plugin in my project to paginate through tables, but because table content is ajax-based, I dont want to allow user clicking two times at next button at once.
The problem is not only mine, as can be seen in this question.

To solve this issue I have added attribute paginationDisabled to pagination widget. When it is set to true - the widget does not responds to clicking and all buttons are marked as disabled.
Is should be used like this:

<pagination 
    total-items="totalItems" 
    ng-model="currentPage" 
    ng-change="pageChanged()" 
    pagination-disabled="blocked"
></pagination>

[wesleycho]

I am not sure this is the best approach - I think hooking into ng-disabled and observing the value would be more performant, as well as less complicated to grasp.

[wesleycho]

Undo this change.

[wesleycho]

LGTM, I will add some documentation and then merge it after getting some sleep.