Adding dependency from specific commit
"devDependencies": {
...
"external-library": "github.com:<user>/<library>.git#<commit_id>
...
}
Example:
"devDependencies": {
...
"ember-power-select-with-create": "github.com:Gorzas/ember-power-select-with-create.git#278c909427a521b7b6d2770140bf8be983fa21b4",
...
}