Implement CLI progress into infinite crawler

[crstauf]

Enhancement for #85.

[leonstafford]

Hard to explain how much joy open source contributions like this bring, especially when it removes things I thought were on my todo list, weighing me down! So much thanks, @crstauf!

I'll do a code cleanup now before progressing further, so will have a lot of little changes to files, in case you're working on something else on top of this branch, it may be good to wait for that cleanup commit to come through

[crstauf]

in case you're working on something else on top of this branch, it may be good to wait for that cleanup commit to come through

Will do!

[leonstafford]

@crstauf that should be most of the syntax checks done for now and pushed up.

I'll need to rework the unit integration tests as I've introduced some static methods that touch wpdb (tsk tsk). Will go for a walk first and deal with that later