Fix data type issue in python 3
Improve usage of doctest directives
Use a better way to comment out the brief examples temporarily
Revert ellipsis to skip directive
Use travis-ci python config
Discard pip installation and install matplotlib from PyPI
Simplify travis config
Touch non-existent matplotlibrc
Fix matplotlibrc configuration
Add python 2.6 and 3.3 environments
Remove python 2.6 and 3.3
Cast label_field to integer dtype for float intput
Fix label2rgb bug
Fix misspelled sections
Fix doc string syntax errors
Reduce runtime of daisy visualization test case
Reduce runtime of radon test cases
Explicitly set sigma value to 0 to avoid warning
Skip show commands for doc tests
we never released -2