background=0 by default.
Modified label function so that background pixels are labeled with 0, and
background=0 by default. All tests of _ccomp.pyx pass
Modified a couple of files to be consistent with the new behavior of
measure.label
Modified doctring of label to pass doctest
Modified TODO.txt as well as release notes to mention the new behavior of
label.
Typo in docstring
Typo in docstring
Changed default value of kw argument background in measure.label
Removed unnecessary and outdated comment
Jeremy Metz