use persitence helper to store/restore state
add an id String for each palette
add method to select a specific palette by its id
update Retain library
update retention-magic library
allow to pass AbstractPalettes as variable arguments instead of an array
update retention-magic library
support variable arguments for setPalettes
Merge branch 'master' of ssh://git.dmfs.org:23023/libraries/color-picker
remove retention magic library
update retention magic library
add missing license header