Fragmenting cylinder example

[pabloseleson]

Adds new fragmentation example

[streeve]

@pabloseleson I got this partially working: I applied the force BC only on the inner layer of particles and get fragmentation as we expect. There is a mistake somewhere leading to a very obvious lack of symmetry

Other things:

• I added the dynamic local critical stretch and did not see a noticeable difference
• We can add contact later for a more physical problem
• This should likely be a velocity BC instead

[pabloseleson]

Current simulation:

Damage.mov