Summary of changes:

1)  Use os.path.sep to resolve file paths on windows correctly
2) renderer.detect() returns the file type instead of boolean
Summary of changes:

return file type in detect()
Summary of changes:

1) return file type in detect()
2) add support to export images in png and jpg formats
Summary of changes:

return file type in detect()
Summary of changes:

return file type in detect()
Summary of changes:

1) pass fileType as an argument to render_exporters()
2) Refactor building of "options" tag list to make it more readable (for
me)
3) Change return type of detect() to return a string (file's extension)
instead of a boolean
Add a PNG image file

To demonstrate exporting it to jpg, tiff, gif formats ...