Add link to G+ community

Change-Id: I7ae7b34e94f5a948717b08ca29e39cb98f2b2af7
Factor out plain attribute parsing pattern

Change-Id: Ibe3f89d9e9341d8ace760a3ad834cff3edc55389
Give named function argument a separate parse element

They have different forbidden name requirements than regular attributes

Change-Id: Ifc0f9e64e6af82ad247e9a1beea5ebebbc3e524d