updated README with info from website
added GPL licence
factorize code about masonry temple
add text to masonry template
add ds-gallery-category support function
add gallery categories navigation template
add support to selecting root gallery using dsframework-root-gallery-category custom field
add support to selecting visible galleries using comma-separated list of slug in dsframework-visible-gallery-categories custom field
fix link issue
add image description to gallery image
Merge pull request #33 from ciotto/gallery_category_navigation_template

Gallery category navigation template
Merge pull request #34 from ciotto/image_description

add image description to gallery image
Merge pull request #31 from hellocatfood/master

Updated README and LICENSE