Custom implementation of the Tumblr Photoset, without support for the Tumblr Lightbox. A bit crude, but it works...

Tumblr photoset

{block:Photoset}
	<script type="text/javascript">
		var layout = {JSPhotosetLayout};
		var photocount = 0;
		var photoclass = '', photos = [];
		for(var i=0;i<layout.length;i++) {
			switch(layout[i]) {
				case "1":
					photoclass = 'col-lg-12';
					break;
				case "2":
					photoclass = 'col-lg-6';
					break;
				case "3":
					photoclass = 'col-lg-4';
					break;
				case "4":
					photoclass = 'col-lg-3';
					break;
			}
			for(var j=0; j < parseInt(layout[i]); j++) {
				photos[photocount] = {
					'class': photoclass,
					rowsize: parseInt(layout[i])
				};
				photocount++;
			}
		}
		photocount = 0;
		var rowcount = 0;
	</script>

	{block:Photos}
		<script>
			if(rowcount == 0) {
				document.write('<div class="row">');
			}
		</script>

		<div id="photosetphoto" class="col-lg-3">
			<script>
				var photo = document.getElementById('photosetphoto');
				photo.className = photos[photocount].class;
				photo.removeAttribute('id');
				rowcount++;
			</script>
			<div class="thumbnail center">
						{LinkOpenTag}
				<img src="{PhotoURL-1280}" alt="{PhotoAlt}" class="img-responsive">
				{block:Caption}
					<div class="caption">
						{Caption}
					</div>
				{/block:Caption}
						{LinkCloseTag}
			</div>
		</div>
		<script>
			if(rowcount == photos[photocount].rowsize) {
				document.write('</div>');
				rowcount = 0;
			}
			photocount++;                                        
		</script>
	{/block:Photos}
	{block:Caption}
		<div class="caption">{Caption}</div>
	{/block:Caption}
{/block:Photoset}