Increase the number of projects per page returned by /recent.json endpoint

[alilosoft]

The /recent.json endpoint currently returns 25 projects per page, and if a bot need to fetch all submitted projects it should make lots of API requests witch is relatively inefficient, so I'd suggest to increase the number of projects returned in a single response to at least 100, and maybe it would make sense to allow the page_size to be passed as parameter.