Not all file-related modules consistently use "path" as the attribute to specify a single filename, some use "dest", others use "name". Most do have aliases for either "name" or "destfile".
This change makes "path" the default attribute for (single) file-related modules, but also adds "dest" and "name" as aliases, so that people can use a consistent way of attributing paths, but also to ensure backward compatibility with existing playbooks.
NOTE: The reason for changing this, is that it makes Ansible needlessly harder to use if you have to remember that e.g. the xattr module requires the name attribute, the lineinfile module requires a dest attribute, and the stat module requires a path attribute.
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