add ipython notebook of ex03
add ipython extension example, simple gaussian fit
Small updates in formatting and wording.

Hey, this looks quite neat!
gaussianfit.py rewritten as a class with changes suggested by Pavol
Update module docstring.  Fix extension loading.
User can now update initial guesses for A, sig, and x0 and these values
will be automatically passed to the recipe
Link attributes to the data in recipe.

Avoid duplicate data in the GaussianFit class.  Run _makeRecipe
first and let the top-level attributes fetch results from the recipe.
Fix Gaussian equation so parameter A is indeed its area.
Add fitGaussian function for quick fitting.

fitGaussian returns the fitted curve and the fit object.
create subdirectories and reorganize the files
remove the ppt file
remove unused cif files
remove unused gaussian profile dat
fix the url in gaussianfit.py
add ipython extension to README.md
update the README.md
update ipython notebook
Merge branch 'master' of github.com:diffpy/srfit-demos
adding ipython notebook to README.md
change ex03.py to LinearFit.py in readme
Convert ipyplugin to importable directory.

Repository base can be now included in PYTHONPATH and the plugins
imported from cmi_plugins namespace.