1.12.0

BUGFIX: Paket add should not update the package if it's already there
BUGFIX: "copy_local" was not respected for indirect dependencies - #856
BUGFIX: Suggest only packages from the installed sources - fsprojects/Paket.VisualStudio#57
BUGFIX: Trace license warning only in verbose mode - #862
BUGFIX: Fix ./ issues during pack
BUGFIX: Serialize != operator correctly - #857
COSMETICS: Don't save the paket.lock file if it didn't changed