show tests-per-sec and resuls-per-sec in views

This has the suite start calculating the rate of tests and results
so that the view can have access to the it.  It also adds it to the
summary of the default view.

This is just so the user has extra stats to keep an eye on their
test suite run time.  It provides a more granular measurement on
the changes in suite run time.  Plus it is fun.
Merge pull request #170 from redding/kr-test-rate

show tests-per-sec and resuls-per-sec in views