Merge pull request #3 from hadjimy/master

Add special topics part 2.
added the solution of the exercise in special topics part 1
Add Advanced topics part 1
Update Advanced topics part 1
Add Advanced part 2
Adding advenced techniques part 2.
Add figures
Upload solutions for the advanced part 1
Add solution for Advanced part 2
Add mpi4py tutorial
Merge pull request #5 from dalcinl/mpi4py-tutorial

Add mpi4py tutorial