Speed up the verify page by limiting results

The verify page is falling over with alarming regularity. This commit
forces each of the 4 data sources to only fetch 50 results. This could
lead to a bit of an awkward user experience but it is certainly better
than the status quo of a 502 timeout error.
Merge pull request #69 from ahinz/bug/verify-page-too-slow

Speed up the verify page by limiting results