Conditionally show more metric details

[camillobruni]

• Collect and report subTimes like subScores
• Only show times if the global .details CSS class is set (the default view is unaffected)
• Also use .details for displaying displayCategoryScores
• Change uiFriendlyDuration to only report 2 significant digits
• Add Benchmark.prototype.wallTime accessor and report that as well
• Use # as unit symbol for console printing

This is the view you'll get after pressing d or clicking on the score:

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[camillobruni]

Now also updated the console output to include durations:

Running babel-minify-wtb:
    First:            32.18   
    Worst:            63.35   
    Average:          92.07   
    Score:            57.26   
    First-Time:      155.35 ms
    Worst-Time:       78.92 ms
    Average-Time:     54.30 ms
    Wall-Time:       973.68 ms
    Total-Time:      288.58 ms

Running acorn-wtb:
    First:            31.00   
    Worst:            30.95   
    Average:          34.69   
    Score:            32.17   
    First-Time:      161.30 ms
    Worst-Time:      161.53 ms
    Average-Time:    144.14 ms
    Wall-Time:      2188.10 ms
    Total-Time:      466.97 ms


First:                48.96   
Worst:                70.11   
Average:              82.78   
First-Time::         102.13 ms
Worst-Time::          71.32 ms
Average-Time::        60.40 ms

Total Score::         65.74   
Total Time::        13608.03 ms

[danleh]

nit: double newline

[danleh]

nit: not so sure about # as the unit, it's not exactly self-explanatory and hard to grep/google. Maybe just spell out score or points?