update to angular 1.5.6
update to angular 1.5.6

1.5.5 was not valid. Was causing issues when deploying from Heroku

Four51/OrderCloud-Seed-AngularJS,crhistianr/angular-buyer,crhistianr/angular-buyer,mlund01/OrderCloud-Seed-AngularJS,ordercloud-api/angular-buyer,ordercloud-api/angular-buyer,Four51SteveDavis/BevMediaPrototype,spencerwalker/angular-buyer,ordercloud-api/angular-seller,Four51/OrderCloud-Seed-AngularJS,BrightMahi/aacBuyerNew,ordercloud-api/angular-admin,etundra-bsmith/angular-buyer,mlund01/OrderCloud-Seed-AngularJS,ordercloud-api/angular-seller,etundra-bsmith/angular-buyer,BrightMahi/aacBuyerNew,Four51SteveDavis/JohnsonBros,Four51SteveDavis/JohnsonBros,spencerwalker/angular-buyer,Four51SteveDavis/BevMediaPrototype,Four51/demo_buyer,ordercloud-api/angular-admin,Four51/demo_buyer