Release 1.4.2

Enhancements:

• smarter way to handle magit buffer:
  • improve some internal mechanisms, which should improve performances for huge repositories
  • by default, do not show untracked/deleted/added/renamed files diffs (ref #28)
  • see g:magit_default_show_all_files new behavior
• add g:magit_default_sections to let user choose which sections are displayed (fix #37)
  user can now choose which sections to display, and in which order

Bug fixes:

• magit buffer become empty after switching to other window and back (#35)
• remove warning when opening magit buffer
• check that magit buffer exists before removing it (refs #39)