Sped up runtime view discovery

Switched the runtime view discovery to look for specific files in
specific folders, rather than the previously inefficient approach
of finding everythign in a folder and whittling it down afterwards.

Phil Jones says it is much faster now, so if it's still slow,
blame him at https://twitter.com/philjones88 ;-)
Merge pull request #983 from grumpydev/ViewDiscoverySpeedup

Sped up runtime view discovery