support ember-template-compiler@1.9.0-alpha

Adds support for ember-template-compiler@1.9.0-alpha and handlebars 2.0.0.
Updates tests expected files according to handlebars 2.0.0*.

Expected files should be reviewed by someone else*.

*Note : Apart from a misunderstanding, expected files should be independent from the compiler (we should compare handlebars dom result or something like this, not the compiler js output), otherwise we don't really compare anything since it's compared with itself or non significative changes will lead to tests failures (i.e. if compiler produces extra commented text).