Lmfit model for xrf

The fitting model for xrf is included. It is still in process, and some file structure might need to be re-organized.
What Tom described is in lmfit already. Can look closer tomorrow afternoon.

On Tuesday, September 30, 2014, Li Li <notifications@github.com> wrote:

> In nsls2/fitting/model/physics_model.py:
>
> > @@ -5,12 +5,6 @@
> >  # @author: Li Li (lili@bnl.gov <javascript:_e(%7B%7D,'cvml','lili@bnl.gov');>)                                        #
> >  # created on 09/10/2014                                                #
> >  #                                                                      #
> > -# Original code:                                                       #
> > -# @author: Mirna Lerotic, 2nd Look Consulting                          #
> > -#         http://www.2ndlookconsulting.com/                            #
> > -# Copyright (c) 2013, Stefan Vogt, Argonne National Laboratory         #
> > -# All rights reserved.                                                 #
> > -#                                                                      #
>
> OK. let's add it.
>
> —
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> <https://github.com/Nikea/NSLS2/pull/158/files#r18258100>.
>