Incorporated fix for ERB to String conversion error

Reference forward3d#81

Author: Sean Smith

lib/cap-ec2/utils.rb

@@ -56,7 +56,7 @@ def load_config
 
       config_location = File.expand_path(fetch(:ec2_config), Dir.pwd) if fetch(:ec2_config)
       if config_location && File.exists?(config_location)
-        config = YAML.load(ERB.new(File.read(fetch(:ec2_config))))
+        config = YAML.load(ERB.new(File.read(fetch(:ec2_config))).result)
         if config
           set :ec2_project_tag, config['project_tag'] if config['project_tag']
           set :ec2_roles_tag, config['roles_tag'] if config['roles_tag']