Support usage inside paralle babel inside inline-hbs
Support usage inside paralle babel inside inline-hbs

Fixes #444.

ember-cli-htmlbars-inline-precompile becomes parallelizable if all the AST transforms inside it are parallelizable. The protocol is supports is *nearly* the same as the one used by broccoli-babel-transpiler itself, but not quite.

rwjblue/ember-cli-template-lint,rwjblue/ember-cli-template-lint