Update namevalue-storage.json

Added a note, safari and ios safari don´t support to set localStorage in private browsing mode.
move firefox to partial because of a known bug

the main use case is for SVG background images is to be scaled 
arbitrarily without being blurry, but that use case results in 
blurred images in firefox.
added note explaining the partial state
pull namevalue-storage patch
merge patch
Merge branch 'jensbambauer-patch-1'
Merge branch 'master' of github.com:Fyrd/caniuse