merge
minor fine tune theme
change navbar.zul to nav.zul
Merge branch 'update-nav-demo' of git://github.com/RaymondChao/zkthemes
update version for release RC version
exclude slf4j for zkthemes
release 7.0.0-RC
update version to 7.0.0-FL
Fix bug ZK-1981: exclude slf4j when building jar
fix the orient of tabbox in tabbox.zul