make loading default facts more robust
make loading default facts more robust

* Merge instead of attempting to append - means default_module_facts can override default_facts
* Make the loading of the files independent of the current working directory
* YAML.read_file doesn't appear to be a valid method - replaced with YAML.load
dhoppe/modulesync_config,voxpupuli/modulesync_config,puppet-community/modulesync_config,dhoppe/modulesync_config,dhoppe/modulesync_config,dhoppe/modulesync_config,voxpupuli/modulesync_config,voxpupuli/modulesync_config,voxpupuli/modulesync_config