fix regression with symbolized fromImage option on Image#create
fix regression with symbolized fromImage option on Image#create

Check for a fromImage option as both string and symbols, this way

> create('fromImage' => 'foo')

behaves again like

> create(fromImage: 'foo')

to restore compatibility with pre-1.24 behavior.

someara/docker-api,swipely/docker-api,someara/docker-api,chasebolt/docker-api,chasebolt/docker-api,pwnall/docker-api,swipely/docker-api,ComputeStacks/docker-api,moritzheiber/docker-api,ComputeStacks/docker-api,moritzheiber/docker-api