Gettin' with the times

Update Rakefile and Manifest.txt to reflect the change of default README
types from txt to md. This ensures that hoe rake tasks such as
install_gem continue to run properly on a newly checked-out repo.
Add example to bin/benchmark_ips

Adding the example given in the Synopsis section of the README to
bin/benchmark_ips. This means that a developer can easily test the behavior
of benchmark/ips by running the script.
Pulling label formatting into IPSJob

Code to right justify the report name is duplicated. Let's pull this
code into IPSJob so that it can easily be referenced.