Added blank datafit.py
Merge branch 'master' into data-fitting

Just that silly fix moving tensor from holzapfel to lintools
Merge branch 'master' into data-fitting

Got holzapfel-P function.
Added matrix norm
Added a naive least squares fit function
Added tensor norm square
Use tensor norm in datafit
Adding tools for preprocessing stress/strain data
Add func to show simplices relative to their first vertex.
Simplified and generalized translating arrays to their first entry
Added ability to keep origin in translated array
Saved important parts of an interactive session
Have all code for munging Golriz's data to F/P
Convert 2d tensors to 3d for Golriz data
Added wrapper to make parameter lambda in fit
Included penalty function in fit