cleaning MTEX functions
preallocation of variables and inversion of for loop and if statements, to speed up the calculations
updated link to MTEX on GitHub
cleaning and update of conf.py in doc
Merge branch 'master' of https://github.com/czambaldi/stabix
add icon for github
Merge pull request #10 from DavidMercier/master

preallocation variable to speed up the code and updated doc