Add support of TableArgs

When test failure, log in karma console does not display tableargs for
step.
For exemple :
Given I init config to
| key   | value  |
| propA | valueA |
| propB | valueB |

is transform to :
.given ('I init config to',
[{"key":"propA","value":"valueA"},{"key":"propB","value":"valueB"}])

to match the step :
.given('I init config to', function(table /* json */)

When the test fail, it display :
...
I init config to
[[{"key":"propA","value":"valueA"},{"key":"propB","v":"valueB"}]]
... FAILED

instead of
...
I init config to
... FAILED