Merge branch 'dev/fix_add_bin'

* dev/fix_add_bin:
  travis: reuse disable vader vim version output
  test/addFile/: add golden files for binary tests
  autoload/magit/utils.vim: fix is_binary function (fixes #27)
  .travis.yml: enable travis for all dev/* branches
  test/: add new tests with new and modified binary files
  plugin/magit.vim: fix stage_block discard
  plugin/magit.vim: stage file when closed (do not need vimagit cached data)
  autoload/magit/git.vim: add git_checkout(), fix git_add() and git_reset()
  plugin/magit.vim: add mg_stage_closed_file function
  plugin/magit.vim: fix big :%s
  autoload/magit/git.vim: git works in a clean environment (no config)
  autoload/magit/git.vim: move all git related functions to git.vim
  autoload/magit/utils.vim: add git_add and git_reset helper functions
  plugin/magit.vim: move git_(un)apply helper functions to utils.vim
  syntax,plugin: fix end of diff display (section title may be non highlighed)
  README.md: add asciinema example (fix #3)
  plugin/magit.vim, autoload/magit/state.vim: add some comments
  plugin/magit.vim: factorize some if statements
  plugin/magit.vim: remove useless window restore commands
  plugin/magit.vim: replace s:set() by get()