Implement missing max_distance parameter
added blob_dog
doctest
added test_blob
doc string
typo
threshold
Changed formula, this improves detected size accuracy
Made get_local_maxima_3d public
It also takes connectivity as a paramater now
changed params and functionality of get_local_maxima
added get_local_maxima to feature
removed get_local_maxima, now using peak_local_max
rectified __all__
added names in CONTRIBUTIRS.txt
Merge pull request #903 from vighneshbirodkar/dog

Blob Detection (DoG)
Fix peak_local_max doc string
Add test case for 3D images
Add test case for 4D images
Merge pull request #906 from ahojnnes/peak-fix

`peak_local_max`: fix docstring, add N-d tests
added blob_log