Flickr API Size enum

var flickr_sizes = {
    'square':       '_s',
    'large_square': '_q',
    'thumbnail':    '_t',
    'small':        '_m',
    'small_320':    '_n',
    'medium':       '',
    'medium_640':   '_z',
    'medium_800':   '_c',
    'large':        '_b',
    'large_1600':   '_h',
    'large_2048':   '_k',
    'original':     '_o'
};