Could not find module ember-validations

Trying to use ember-validations plugin for ember-cli. Bumped with this issue that I can't figure what is missing.

Here is the dependencies part in my package.json:

"devDependencies": {
    "broccoli-asset-rev": "^2.0.0",
    "broccoli-ember-hbs-template-compiler": "^1.6.1",
    "ember-cli": "0.1.9",
    "ember-cli-6to5": "0.2.1",
    "ember-cli-content-security-policy": "0.3.0",
    "ember-cli-dependency-checker": "0.0.7",
    "ember-cli-ic-ajax": "0.1.1",
    "ember-cli-inject-live-reload": "^1.3.0",
    "ember-cli-qunit": "0.1.2",
    "ember-data": "1.0.0-beta.12",
    "ember-export-application-global": "^1.0.0",
    "express": "^4.8.5",
    "glob": "^4.0.5",
    "ember-validations": "~2.0.0-alpha.2" //Also tried with "~ 2.0.0" as advised in the guide
}

And a simple controller which looks like this:

import Ember from 'ember';
import EmberValidations from 'ember-validations';

export default Ember.Controller.extend(EmberValidations.Mixin, {
    actions: {
        //....
    },
    validations: {
        mailid: {
            presence: true
        },
        password: {
            presence: true
        }
    }
});

But looking the route in the browser gets an error message in the console:

Could not find module ember-validations

Not sure what I'm doing wrong. Any help appreciated.