[dev-*/*] Import some yummy things from @javer overlay (thanks, dude). TODO: rewrite ebuilds

Signed-off-by: Vadim A. Misbakh-Soloviov <mva@mva.name>
[www-servers/nginx] bump

Signed-off-by: Vadim A. Misbakh-Soloviov <mva@mva.name>