Output filename collisions

[c-lliope]

currently, if there are two or more files with the same root name and different extensions
(ex: user.rb and user.js), the generated documentation filenames will both map to docs/user.html

$ touch user.js
$ touch user.rb
$ docco index.rb index.js
docco: index.js -> docs/index.html
docco: index.rb -> docs/index.html
$ ls docs/
docco.css  index.html public

Suggested fix:

Include the original file extension before the .html on documentation pages. In the earlier example, this would result in:

$ ls docs/
docco.css  index.js.html  index.rb.html  public

[c-lliope]

This would also allow the creation of a docs/index.html without worrying about collisions from a project's index.html