Bump to version 1.5.1 needed for mate-panel 1.5.5
Bump to version 1.5.5

Update DEPEND to require libmatewnck 1.5.1.
Bump to version 1.5.1
Bump to version 1.5.3

Update sed, configure.in is no more, only configure.ac.
Also the eel/Makefile* do not refference the cflags directly anymore
so take this out as well.
Bump to version 1.5.5