accumulate test/result data (instead of just storing raw objects)

[kellyredding]

Goals:

• use less memory b/c we no longer store every result generated
• speed - output test results more quickly b/c we aren't counting objects in memory

This is especially painful on a big app of ours whose test suite generations over 28000 results.

• increment a counter when a test starts
• increment counter(s) on each new result
• don't store anything for results you aren't going to dump
• unshift tests as they are run so they get garbage collected along the way
• don't store result objects - just store the raw data points needed for the view