Merge branch 'next'

* next:
  Update Changelog
  plugin/magit.vim: move s:magit_commit_mode to buffer variable b:magit_current_commit_mode
  plugin/magit.vim: move s:state to buffer variable b:state
  plugin/magit.vim: display commit mode in Info section
  syntax/magit.vim: rework section title color
  Update Changelog
  README,doc: add notes that magit handles multiple git repo
  README,doc: misc changes
  plugin/magit.vim: add mappings N and P to jump to next and previous hunk (fix #25)
  syntax/magit.vim: add some color in Info section
  plugin/magit.vim: disable inline help by default (fix #46)
  plugin/magit.vim: update inline help
  state.vim: display modified files first
  plugin/magit.vim: in show_magit(), always open buffer with :buffer command (fix #41)
  plugin/magit.vim,autoload/git.vim: yet another rework of magit#show_magit() (fix #41)
  plugin/magit.vim,autoload/{git,sign}.vim: magit can handle multiple git repository within one vim session (fix #44,#34,#29)
  plugin/magit.vim: add MagitOnly command
  plugin/magit.vim: better handling of magit buffer, including clean quit command (fix #43)