Allow for ES6ConcatenatorCompiler outputFile to go into a directory
Allow for ES6ConcatenatorCompiler outputFile to go into a directory

gabesoft/broccoli,osxi/broccoli,broccolijs/broccoli,broccolijs/broccoli,jnicklas/broccoli,rwjblue/broccoli,ember-cli/broccoli,ember-cli/broccoli,gabesoft/broccoli,gabesoft/broccoli,broccolijs/broccoli,broccolijs/broccoli,ixisystems/broccoli,osxi/broccoli,ixisystems/broccoli,osxi/broccoli,ember-cli/broccoli