New option: -N, set X window resource name
Overhauled window drawing

- Draw onto pixmap as before, but use the same size for the pixmap as
  for the window, allocate new pixmap after configure requests
- Use XCopyArea() instead of XSetWindowBackgroundPixmap(), which now
  requires handling of Expose events
Smaller minimum gif delay, fixed issue #71
Fixed BadDrawable errors caused by invalid window pixmap
Next try to fix issue #71
Merge branch 'newdraw'
Merge branch 'winname'
Fixed issue #72
Added Download/Changelog section to README
Moved screenshots to gh-pages branch
Fixed issue #73
Fixed issue #74, conditional compilation of gif support
Fixed compilation with giflib version 4.2.1
Merge remote-tracking branch 'upstream/master'