Get repository should support wildcards

[clintongormley]

These work:

GET /_snapshot/
GET /_snapshot/_all
GET /_snapshot/name
GET /_snapshot/name,name

But wildcards don't:

GET /_snapshot/*
GET /_snapshot/prefi*

[dadoonet]

Wondering if we should also support regex?

We were talking about it about templates with @kimchy to support wildcards (simpleMatch) or regex when using notation like regex:YOUR_REGEX_HERE. WDYT? Does it worth it for snapshots or useless?

Note: it's not implemented yet for templates.

[jsnod]

I'd like this for delete operations as well, eg:

curl -XDELETE 'http://localhost:9200/_snapshot/myrepo/snapshot_201405*'