add new option `g:markdown_enable_insert_mode_leader_mappings` and update defaults and documentation
Merge pull request #9 from wilmoore/markdown_enable_insert_mode_leader_mappings

add option to enable insert mode leader mappings with a default off off ...
updates vundle instructions and adds neobundle
Merge pull request #11 from wilmoore/update-install-info

updates vundle instructions and adds neobundle