Support Arrays in browserify conf

[dasilvacontin]

Before, exclude and ignore would not accept an Array of paths since
Browserify.prototype.exclude/ignore was expecting a single file as
argument.

Need to check if this change breaks behaviour for other browserify opts
that do accept or expect an Array as arg.

[mention-bot]

By analyzing the blame information on this pull request, we identified @rase-, @vvo and @bevacqua to be potential reviewers

[defunctzombie]

missing { } for if statement body

[dasilvacontin]

Fixed.

[dasilvacontin]

Please double check if the change does not break some other option that only accepts an array, since I didn't check it myself.

[defunctzombie]

@dasilvacontin please check that or better yet write a test for this.

[dasilvacontin]

• Browserify.prototype.plugin accepts a single function/plugin per invocation. If invoked using an array, the first element is the function/plugin, and the second element is the opts object.

  This means zuul doesn't currently support the definition of multiple browserify plugins via zuul.yml, and that my change-set is a breaking change for people that specify a plugin and its opts using an array, even if my change-set would effectively add support for definition of multiple browserify plugins.

  A solution could be – in case of being provided an array – to check if the type of the second element in the array is an object.

(gotta go, will investigate the others later)