Add Cognito support

README.md

addon/components/login-cognito-bootstrap.js

addon/components/logout-cognito-bootstrap.js

addon/templates/components/login-cognito-bootstrap.hbs

addon/templates/components/logout-cognito-bootstrap.hbs

app/components/login-cognito-bootstrap.js

app/components/logout-cognito-bootstrap.js

...ws-ehipster/files/__root__/controllers/cognito-private.js

...r-aws-ehipster/files/__root__/templates/cognito-login.hbs

...aws-ehipster/files/__root__/templates/cognito-private.hbs

blueprints/ember-aws-ehipster/index.js

blueprints/jdl-importer/index.js

package.json

vendor/aws-sdk.min.js

vendor/jsbn.js

vendor/jsbn2.js

vendor/sjcl.js