Media Library Image Sizes in Bones theme (add_image_size)

If your theme already includes: 

add_theme_support( 'post-thumbnails' );

Then you can just add a new size in functions:

add_image_size('custom', 70, 70, TRUE);

http://codex.wordpress.org/Function_Reference/add_theme_support
http://codex.wordpress.org/Post_Thumbnails

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