Add option to automatically redirect browser logs

[gunta]

This is a feature request about usability.

Currently, to see the browser console errors/logs, one has to write the following in every test suite, which is far from being user-friendly:

afterEach(function() {
    browser.manage().logs().get('browser').then(function(browserLog) {
      console.log('log: ' + require('util').inspect(browserLog))
    })
  })

Please add an option like browserLogs: true to be able to accomplish this in any project/suite without having to resort to the above code.

Also, currently even by executing this, one gets a quite ugly (non formatted and uncolored) log like the following:

log: [ { level: { value: 1000, name: 'SEVERE' },
    message: 'http://localhost:7120/api/v1/auth/mock 0:0 Failed to load resource: the server responded with a status of 400 (Bad Request)',
    timestamp: 1409043866570,
    type: '' },
  { level: { value: 1000, name: 'SEVERE' },
    message: 'http://localhost:7120/api/v1/auth/mock 0:0 Failed to load resource: the server responded with a status of 400 (Bad Request)',
    timestamp: 1409043867771,
    type: '' },
  { level: { value: 1000, name: 'SEVERE' },
    message: 'http://localhost:7120/api/v1/auth/mock 0:0 Failed to load resource: the server responded with a status of 400 (Bad Request)',
    timestamp: 1409043900321,
    type: '' } ]

The above could be improved easily by human-readable formatting and some nice coloring.

Given that currently a lot of errors will go unnoticed, and the whole purpose of testing is to be aware of bugs early and often, it seems important that this option is set to true by default.

[juliemr]

I think this is a good idea - there's a lot here that we could do to improve the experience.

[hilnius]

Going a little further, I didn't find any issue related to the log_level, but it would also be cool to be able to change the log level that we obtain.

[juliemr]

@hilnius unfortunately WebDriver doesn't allow changing the log level below warning :(

[juliemr]

Done with #1916