added output_style parameter to formatter (closes #070)
added output_style parameter to formatter (closes #070)

now, you can configure CLI output styles through new
special output_style option in your behat.yml:

default:
  formatter:
    name:           pretty
    parameters:
      output_styles:
        comment:    [black, white, [underscore]]

this will force Behat to print comments (key of the style)
with black foreground (first parameter), white background
(second parameter) and as underscore (list of options -
third parameter).

Styles available to redefinition:

  - undefined
  - pending
  - pending_param
  - failed
  - failed_param
  - passed
  - passed_param
  - skipped
  - skipped_param
  - comment
  - tag

Available colors for first two arguments (fg and bg) are:

  black, red, green, yellow, blue, magenta, cyan, white

Available options are:

  bold, underscore, blink, reverse, conceal

Behat/Behat,spolischook/behat,Taluu/Behat,spolischook/behat,v-abramchuk/Behat,spolischook/behat