Merge pull request #19 from infirit/master

back to libwnck
let 'make dist' create tar.gz and tar.xv tarballs
Sync translations with transifex
remove creating gz tarballs
Merge pull request #21 from NiceandGently/master

let 'make dist' create tar.xz tarballs
Add update-icon-cache config option for makedistcheck
Remove non existing INSTALL file from EXTRA_DIST
Fix EXTRA_DIST gsettings variable
Add CLEANFILES to delete generated schema file