Extend createTab to open specific pages.
Extend createTab to open specific pages.

Example:

    map a createTab http://edition.cnn.com/ http://www.bbc.co.uk/news

which creates two new tabs, but preloaded with these specific URLs.

`2a` creates four new tabs, two copies of each.

Limitation:

- We cannot control the order of the tabs, so we might get CNN then BBC,
  or BBC then CNN.  This happens because command options are stored in
  an object, and we cannot control the order of the keys.

Also, with:

    map a createTab http://www.bbc.co.uk/news http://www.bbc.co.uk/news

we only get one new tab (same reason as above).

gdh1995/vimium,decaffeinate-examples/vimium,gdh1995/vimium,smblott-github/vimium,mrmr1993/vimium,poacher2k/vimium,mrmr1993/vimium,decaffeinate-examples/vimium,philc/vimium,philc/vimium,smblott-github/vimium,gdh1995/vimium,poacher2k/vimium,decaffeinate-examples/vimium,smblott-github/vimium,mrmr1993/vimium,philc/vimium,poacher2k/vimium