Fixes issue 20, fixes issue 21, and fixes issue 22 for mochify/renderly. Added a default report name and made the name optional in RenderlyApp. Fixed issues where the report layout was not being created in the case where all test cases run succeeded. Fixed problem where RenderlyNativeAssetManager.FetchToRandomFilename did not ensure that a directory existed before trying to copy a file to it.
Merge pull request #23 from birryree/develop

Fixes issue 20, fixes issue 21, and fixes issue 22 for mochify/renderly....