Add a skipQueue option

Defaults to false. If set to true, the queueing mechanism will be
disabled: requests will be made in real time, but the rating limit
protection will be disabled.

Closes #4
Merge pull request #5 from bpierre/skip-queue

Add a skipQueue option

Defaults to false. If set to true, the queueing mechanism will be
disabled: requests will be made in real time, but the rating limit
protection will be disabled.

Closes #4