Add changelog

CHANGELOG

+v0.2.4 [2012-09-07]
+- Fixed some file system permission issues
+
+v0.2.3 [2010-07-14]
+- Added support of BoxBackup 0.11 (thanks to Christopher and David)
+- **Does not work with BoxBackup 0.10!**
+
+v0.2.2 [2009-04-18]
+- Added configurable path to sudo
+- Reset sudo return value on failure
+- Fixed HTML layout (attribute image)
+
+v0.2.1 [2009-03-05]
+- First public release