Ruby: Replace all file-name underscores when creating module name.
Ruby: Replace all file-name underscores when creating module name.

The previous implementation replaced only the first.

cook/yasnippet-snippets,ageekymonk/yasnippet-snippets,cook/yasnippet-snippets,ageekymonk/yasnippet-snippets,ageekymonk/yasnippet-snippets,cook/yasnippet-snippets