Merge pull request #47 from atomicules/make-note-list-only-window

Make the Simplenote list/index the only window on screen
no more develop branch
Don't use buffhidden=delete on scratch buffers

With this set, if a note is opened and then switched away from it
disappears which was not intended functionality.

Fixes https://github.com/mrtazz/simplenote.vim/issues/44
Change errant tabs to spaces
Auto set buffer filetype to markdown if checked as md in Simplenote

Read "systemtags" property in note to check if indicated as markdown in
Simplenote. If it is then set buffer filetype to markdown

Fixes #49
Merge branch 'master' into mine