Don't mutate opts

Author: maschwenk

lib/docker/container.rb

@@ -332,10 +332,11 @@ def store_file(path, file_content)
 
   # Create a new Container.
   def self.create(opts = {}, conn = Docker.connection)
-    name = opts.delete('name') || opts.delete(:name)
+    name = opts['name'] || opts[:name]
     query = {}
     query['name'] = name if name
-    resp = conn.post('/containers/create', query, :body => opts.to_json)
+    clean_opts = opts.reject {|key| ['name', :name].include?(key) }
+    resp = conn.post('/containers/create', query, :body => clean_opts.to_json)
     hash = Docker::Util.parse_json(resp) || {}
     new(conn, hash)
   end