Bower install: No versions available
The reason that Bower does not see any versions of your package is that your repository contains only a single tag - v1.0 - which does not follow semantic versioning.
Bower versions can be Git tags or branches. The version number must be a valid semantic version (semver).
The reason that you manage to install using a star target ("angular-ngkit": "*") is that in this case if there are not valid tags, Bower will fallback to the latest commit on master.