init of model sum in GUI level of vistrails
add prefix name to model
ENH/TST : add decorator to skip tests
Merge pull request #185 from tacaswell/skip_decorator

ENH/TST : add decorator to skip tests
clean up functions
add quadratic model
add doc for parameters
add more tests
add fit function on a list of x,y
Merge pull request #186 from licode/model_sum

Model sum
API : removed function that was too clever

bin_image_to_1D was far to clever for the benefit it provided.

It alleviated the need to make one call at the cost of adding
a function with took a function as an argument and needed
to be able to blind-pass dictionary of kwargs through.  This
is a nightmare for wrapping at vistrails and difficult to
document or debug for API-usage.
Merge pull request #190 from tacaswell/remove_image_to_1D

API : removed function that was too clever