Added custom navigation links

[samaroo]

Description

I added two new props the the "Carousel" component: "endOfCarouselLink" and "beginningOfCarousel". The "endOfCarousel" prop takes a URL as an argument and redirects to that link when you try to scroll past the end of of the last slide in the carousel. Likewise, the "beginningOfCarousel" props takes a URL as an argument and redirects to that link when you try to navigate backwards when on the first slide. I modified the "advancePage" to handle the cases when you try to scroll past either end of the carousel and redirect to the appropriate link.

Motivation and Context

#294

How Has This Been Tested?

This was tested by hand using vue-play to make sure the changes work and do not break the current functionality of the carousel.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
  • I have updated the documentation accordingly.
• I have included a vue-play example (if this is a new feature)