Generate HTML for a 4-wide bootstrap thumbnail

Usage

thumbnail(title, img, href, caption = TRUE, source = NULL, ncol = 3)

title: Used as title for the link tooltip and as caption is caption = TRUE.
img: link to the image to use in the thumbnail.
href: link to use when the image is clicked.
caption: if FALSE, only the image will be shown without a caption below.
source: link to a source repository. if caption = TRUE, will be added as a clickable link of the form (Source)
ncol: Number of column for the grid : 3 (default) or 2.