Adding resizing to the feature extraction process;
Fixing file reading and using the new folder structure (image names are 7 digits;
stored in folders named as 4 digit prefix)
Changed fields of imdb structure; will update to contain more metadata from
the new text files;
Experimented with hessian interest point detector (similar to last year's demo).

vl_kmeans added and commented out --> fails with out of memory message.
Merge branch 'master' of vlfeat.org:vedaldi/practical-instance-search
updating painting crawler (impressionists & post)
moving painting crawler; adding the script to retrieve all paintings from all painters
improves thresholds
reverts Mircea changes as they are incompatible with the old format
reverts anoter Mircea's change
adds interactive visualization of homography