Added Multi-Template, A-Z browse

[qjhart]

This adds an additional feature to the api/browse endpoint. If you do not supply the endpoint with a prefix p, then the API will respond with a result count of all the letters. The result looks like this:

[
{
"params": {
"size": 0,
"from": 0,
"p": "A"
},
"total": 7,
"hits": []
},
{
"params": {
"size": 0,
"from": 0,
"p": "B"
},
"total": 9,
"hits": []
},
...

This may look a little strange at first, but this the equivalent to the idea that the client made a set of template queries like /browse/?p=A&size=0 and then combined them together into an array. This will be consistent if we need to do other multi-template searches.

[qjhart]

@UcDust Please review, and I'll commit

[qjhart]

@UcDust I forgot you were out. I've just commited this, but please review

[UcDust]

@qjhart Seems like what we need, I'll test things out later today.