this is 0.8 final

--HG--
branch : 0.8
back to dev

--HG--
branch : 0.8
merge with 0.8
Added tag v0.8.0 for changeset f6ed7119860f

--HG--
rename : lib/sly/Slice/RendererImpl.php => lib/sly/Slice/Renderer.php
extra : rebase_source : 14f077aa7a7ca466f174ac8beeb7775dfbaa18b7
remove a usage of i18n in core
remove debug entry
it is an invalid argument
sophisticated but less buggy loading of the config
fix function name
catch errors
fix doc
new style for build functions
fix api usage
moved to backend
do not change type if it is already set
explizit store data in config
fid online revision by default
fix getAllRevisions
fix doc
add online status to revision select