Added initial implementation of ManifestTool
Added feature to modify manifest files.
Replaced String.isEmptry() by checking the length. This is required because the code has to build on 1.5
Corrected directory used to find jars
 - Improved logging
 - Added missing unmount of TrueZIPs virtual file system.
 - Various bug fixes
 - Added feature to auto generate the application name entry for the Manifest.
 - Changed ManifestFile to handle entries as Map.
 - Remove some obsolete handling in ManifestEntry.