Merge pull request #22 from sciunto/master

Various minor enhancements from sciunto
added test of NIST StRD data using only scipy.optimize._minpack._lmdif() directly -- no use of lmfit at all.
added test of NIST StRD data using only scipy.optimize._minpack._lmdif() directly -- no use of lmfit at all.
add support for Nelder-Mead and other scalar minmization methods from scipy.optimize.fmin and scipy.optimize.minimize
switch setup.py to setuptools
tweaked setup.py
added initial support for uncertainties in mathematically constrained parameters, using uncertainties package -- needs testing
removed PKG-INFO
cleaned up error propogation code
updated doc
support reporting uncertaintes in printfuncs
fixed several typos, standard errors now reported for constrained parameters
added several tests
add simple example from doc
some cleanups, replace 'engine' with 'method'
updated several tests
updated docs
version to 0.7
Merge branch 'with_fmin'
add check of initial value being outside bounds