Version bump

(Portage version: 2.2.8-r1/cvs/Linux x86_64, signed Manifest commit with key 0xF52D4BBA)
Update postinst message, bug #521728

(Portage version: 2.2.8-r1/cvs/Linux x86_64, signed Manifest commit with key 0xF52D4BBA)
Version bump (bug #498834), thanks to Elias Probst.

(Portage version: 2.2.10/cvs/Linux x86_64, signed Manifest commit with key 0x1A5D023975B0583D!)