Merge pull request #338 from duggiefresh/master

Remove nonexistent links
Bump ember-source version.
Merge pull request #342 from ugisozols/bump_ember-source_version

Bump ember-source version.
"if rails_engine?" needs to be checked before configuration.
Merge pull request #344 from ionmx/master

"if rails_engine?" needs to be checked before configuration.
Update README for latest ember-source