Dynamic Counting

I'm quite happy with this! Some fixes and feature additions that I thought would have to wait until the next version:

* Sets a limit of 5 posts to the recent blogs page
* Sets a limit of 25 items to each RSS feed
* Fixes error if user enters no categories on their first blog
* Switched from `-` to `:` in blog lists

Not in this pull, but still needs doing:

* [ ] [BUG] Catagory Cloud doesn't stick to the limits given
* [ ] [FEATURE] Catagory Cloud word colouring not implemented
* [ ] [ENHANCEMENT] Dates still look out of place on recent blogs list
* [ ] [BUG] Catagory is spelt wrong **everywhere**. 

The only bug I'm aware of is that the catagory cloud doesn't work prop