patched code to allow for self_closable tags
added explaination of TagSifter#process_text
Add [list] and [*] tags

Update regex to match * tags
Update TagInfo for the updated regex (resulted in a new caption)
Add tags
Add tests for the new tags
Remove 'self closable' for [li] tag

This is as it used to be (and what is expected)
Note that the [*] tag can be used for self closing list items (in combination with the [list] tag)