Correcting CSharp packaging message

Change-Id: Ie135a698036ec620cb0009fe29469857fdeb4a6f
Using relative path for package directory

Using the full path causes the jar program to create the file in the
archive with the full path.

Change-Id: I44ffbe5087fbe89eaea3360ce43d66d43b6e7073
Merge topic 'SIMPLEITK-376_UseShortPathInZips' into next

f47f93d Using relative path for package directory
8084a84 Correcting CSharp packaging message