Started work on #37.
Removed an assumption about folder names from Bundles, replaced by discovering all bundles then comparing against those in the DB to determine which have been removed. Renamed Parser arg to be more accurate, and removed nodecg.json check from Bundles since Parser does it.
View links are still broken.
Refactored '/view/:view_name*' to use Bundles.find().then(), removing another assumption about folder names.
Fixes #37
Merge pull request #39 from nodecg/issue-37

Remove assumptions about folder names of bundles