Merge branch 'develop'
Added .gitignore file
Added animation in the Detail View Controller.
When user slides to the Detail View Controller, photo and text label appear with animation.
Added second type of animation.
fix bugs with representation photos on the collection view.
When you scroll collection view down and then return to the up, the first two pictures
has photos of the two last collection view cell.
Refactor
Added multiple tags, bug fix.
Added activity indicator.
Merge branch 'develop'

Conflicts:
	.gitignore
Merge branch 'master' of https://github.com/vanyaland/FlickrViewer