Fix pix share read

this should fix https://github.com/umlaeute/Gem/issues/9

these 3 commits are useless but I don't know how to delete them : 
https://github.com/avilleret/Gem/commit/e5821dab3f2a1127678d8d1cd8abdae8a29570ae
https://github.com/avilleret/Gem/commit/65f441d8db91c7fd8ab83f776a0976229b4085b9
https://github.com/avilleret/Gem/commit/8727d2f842dcebee43f15d8eadda28cc2e1963ad