add apache bench results and load/memory graph

Ran 10,000 ab request with a concurrency level of 5.

Ran servers with:
  java -cp http-benchmarks-1.0-SNAPSHOT.jar com.bfritz.rpi.HelloWorldJetty
  java -cp http-benchmarks-1.0-SNAPSHOT.jar com.bfritz.rpi.HelloWorldScalatra

Waited a few seconds after each server bound to 8080 before
starting first ab run.  Ran ab 3 times against plain Jetty
followed by 3 times against Scalatra on Jetty.  Waited ~10
seconds between each of the 3 ab runs.