added auto enumerate support for # list, parenthesis, half-parenthesis kind of list
added empty list logic for -,+,*,#. and all parenthesis lists
readme updated for # list and parenthesis, half-parenthesis styles of list support
linux and mac os keymap updated for new list feature
Merge pull request #32 from IanFang/new_list_feature

Support of auto numbering of list using #, all parenthesis and half-parenthesis list.  (Thanks Ian!)