Bob to compile tpls

Set up function to compile handlebars templates through Bob.

Some of the work in this sets out structure/scaffold in site directory, this was to help test compile function and needs looking at in upcoming tickets.

@MCooke and @nickine if you could take a look at the commits that would be great.

I will raise some issues on the back of this (need to get Travis happy) and won't merge until I am happy with everything.
Maybe, I just used the convention we have throughout the file.

Perhaps we can have an issue to look at changing this through the file? This may also help address the callback point above that keeps falling over when I change it.