Merge branch 'master' of git://gitorious.org/xcf-pixbuf-loader/mainline

* 'master' of git://gitorious.org/xcf-pixbuf-loader/mainline:
  Fix parts of some possible loops with old XCFs
  Misc GIO patches
  Fix assertion when opening .gz files with an old GIO
  Add support for BZ2 compression using GIO
  wrap .xcf.gz support in conditionals
  Make sure temporary files are removed before parsing
  Add xcf.gz support through GIO's GConverter
  Use glib macros for byte-swapping
  updating INSTALL