Add showTimeSpent option to also show how long each test took

[ldub]

Adds an option to the reporter options to show the time spent as well as the gas consumption.

Notes:

1. Unit tests are currently broken (at least on my system) they fail on master branch when I run npm run test:

  1) Contract: VariableCosts prints a table at end of test suites with failures:
     AssertionError: Unspecified AssertionError
      at Context.it (test/variablecosts.js:49:5)
      at <anonymous>
      at process._tickCallback (internal/process/next_tick.js:188:7)

2. Would you like to default showTimeSpent to true?
3. I had to refactor the 'Load config' section from gasStats.js to index.js

Preview:

[cgewecke]

Thanks, this is nice. @chapati23 suggested the same improvement in #76 and I was a little unsure whether it made sense because gas reporter runs slower than un-reported tests. But now that I see it's great. . .

A single test fails intentionally because for a long time there was a problem getting the chart to output when any mocha test failed. So CI here is a weird visual inspection test that always passes while failing . . .

On that note, - if you have a sec could you add your new option to the reporter options for the second visual test here?

RE: should it be on by default: do you think it should be on by default?

[cgewecke]

I think it looks slightly cleaner without the time, but this is completely subjective. . . the time is useful if you're trying to make your tests run faster.

[ldub]

Interesting, I didn't see that issue before but I read it and I see that other projects run their tests with gas reporter and without to test time and gas separately. I suppose that makes sense, but for most of my purposes I'll be using the gas reporter and turning on showTimeSpent mostly as a sanity check.

I'd opt for on by default as it shows at a glance whether anything is taking an abnormally long time. Your choice though!

Pushing requested changes shortly.

[cgewecke]

Awesome @ldub, thank you.

[cgewecke]

Published in 0.1.8 - I left it as an option for the moment - will revisit though. . .