Update slip_transmission_toolbox.rst

changed math to properly reflect vector quantities and (descriptive) labels. I am not sure that I get the GSF formula: why n^T at the end and not just n?
Merge pull request #15 from techfips/patch-1

Thanks. I am going to do it for the resolved shear stress as well and the scheme of slip transmission. For the GSF formula you're totally right. The matlab function is still correct but I will modify the doc.
Merge pull request #16 from RaulSanchezMartin/master

Debug related with the bias definition for Abaqus solved.
updated documentation and GSF function based on pull request #15
removed some "cd" commands, not good in a GUI because you should revert later;
--> too much housekeeping, so just make everthing relative to STABIX_ROOT
Final implementation of the python code to generate SX models (abaqus) in STABiX