renamed xml to xls

This file is going to be the stylesheet to display my input data.
configuration folders

The code will be designed to take folders with the configuration
information for each analysis.  This will start with the
"investigations/sensitivity2013" folders and go from there.  New folders
will be added at a later date.
bin/config/poptea.xml

Order of unknown parameters were shifted during testing.  Also the lower
bound of xRange was increased from 0 to 0.2 in order to prevent the
best-fit anylsis from stalling from insufficient data.
investigations demo

created a demo function that will allow me to run a demo of the
1) best fit 2) pie analysis 3) optimization process
declarations for sensitivityvaldes2013
bug with bisection method

There was an issue where the bisection method was throwing an error
based on the range of the transformation. Example.  Wanted to test 0.23
and the limit was 0.23. But because these value are stored as float;
sometimes it would fail.
initializePopteaAndLoadSimuEmission

created a function in the sensitivity2013valdes namespace that loads a
poptea kernal and prepares it for a given emission field.  This will
likely be split in the future.
demo

added demo callout