Add status checks to the test runner

[BillWagner]

Contributes to #1125

Replace the existing logging code with the utility class that writes to the console, and adds a status check record.

Log failures as status checks, but status is only to the output console.

[jskeet]

Will review on Tuesday when I'm back at work.

[BillWagner]

ping @jskeet for review

[jskeet]

Sorry for the delay. Will do it first thing tomorrow UK time, when I'm not in meetings...