Log Message:
py-lmfit: updated to 0.9.11

0.9.11:
make exception explicit

0.9.10:
add AMPGO and basin-hopping global optimization methods.
aborting a fit from the objective function now raises AbortFitException
fit statistics are more uniformly calculated.
the uncertainties package is now an external dependency, and an out-dated copy \ 
is no longer kept in lmfit.
more exceptions when import matplotlib are now tolerated.
many documentation fixes.