chore(deps): upgrade angular to 2.0.0-beta.7
chore(deps): upgrade angular to 2.0.0-beta.7

fix #56

ghpabs/angular2-seed-project,ghpabs/angular2-seed,ghpabs/angular2-seed-project,ghpabs/angular2-seed,ghpabs/angular2-seed-project,ghpabs/angular2-seed