Benchmarking h11

See the asv docs for how to run our (currently very simple) benchmark suite and track speed changes over time.

E.g.:

• PYTHONPATH=.. asv bench

Or for cases that asv doesn't handle too well (hit control-C when bored of watching numbers scroll):

• PYTHONPATH=.. pypy benchmarks/benchmarks.py
• PYTHONPATH=.. python -m vmprof --web benchmarks/benchmarks.py
• PYTHONPATH=.. pypy -m vmprof --web benchmarks/benchmarks.py