comment to explain a bug
Revert "REVERT commits for raw handlebars rendering. We need to create a"

This reverts commit a4363e033d70bdd08f173c2cd8a44a8b520088c4.
PERF: use raw rendering for topic list

rename my handlebars helper to "raw",
create ember compat handlebars to handle rendering
patch ember rails to use the correct precompiler