templates loaded as plaintext documents, not html docs

jQuery was breaking <elements {{#withblocks}}aroundelements{{/withblocks}}> when parsing template into document. To avoid this, load the template as plaintext and Hogan can take care of itself.
RESTemplates.load(name) preloads template for RESTemplates.getSync(name) later

Assumes RESTemplates.getSync() will not be called synchronously or within the next 500ms

This is in contrast to RESTemplates.load(name, callback) which is safer but callback hell.