Add benchmarks for zipper creation and a basic traversal.
Add benchmarks for zipper creation and a basic traversal.

Issue #121.

Signed-off-by: Austin Seipp <e672e89da89e9883fbf1dfdcea7453aa4c4c7323@gmail.com>

cdepillabout/lens,Gabriel439/lens,danidiaz/lens,Icelandjack/lens,ddssff/lens,omefire/lens,hvr/lens,timjb/lens,Fuuzetsu/lens,cchalmers/lens,rpglover64/lens,hvr/lens