**Changes(index+css): I added a select element so the user can select how many results per page for each call. I also deleted some of the bootstrap grid and added some css of my own.
**(search.php): I added the limit that the search will return. After doing some research I discovered that flickr will only return 4000 photos max. Depending on the choice of the user I calculated where the last page is going to be and I disabled any way to advance into higher pages.
**(search.php)part2: Pagination - I wrote the pagination from scratch. Added the option for the user to advance to the last page, first, next and previous. I added a counter so the user can jump one page up, two, and three.