Add ElasticBeanstalk summary page
Add spec for /elastic_beanstalk/summary and fix view's bugs.

In AwsPortal::ElasticBeanstalk.get_elasticbeanstalk_applications, call AWS::ElasticBeanstalk.describe_environments, and refer nil member ":applications".
So change method from describe_environments to describe_applications.
Merge pull request #14 from betahikaru/feature/eb

Add ElasticBeanstalk summary page