Update branchability.rb

add support for a different USER

lib/shared/branchability.rb

@@ -19,7 +19,7 @@ module Shared
 
       user     = parts.shift
       standard = parts.shift
-      error "invalid user: #{user}" unless ENV['USER'] == user
+      error "invalid user: #{user}" unless [ENV['FEATURE_USER'],ENV['USER']].include? user
       error "invalid branch: #{standard}" unless standard_branches.include? standard
       feature  =  parts.join('-')
       { user: user, standard: standard, feature: feature }