[#295] patch require to test blocks.js

I kind of changed my mind about brfs, using fs.readFile in every block and component actually kind of sucks and presents more opportunities for bugs (e.g. forgetting to specify a content type, and getting a buffer instead)

I think patching require to import html with readFile in node for tests is better 
Node's bulk-require only exposes a folder with index.js in it as folder.index; bulkify also exposes it this way