Remove 'something_name_id' in the url scheme

[sjgreig27]

This is very much a hangover from my project.

In the URL scheme, a number of parameters are called things like 'fragmentation_set_name_id'. This is confusing as it isn't clear if the value is the name of the thing or it's primary key. I've done a bit of a tidy of the urls and views to fix this.

I also found that the 'get_fragments_as_text' url was missing from FrAnK but I found the view and added the url back into the URL scheme.