www-servers/nginx: Bump ebuild of stable slot to update 3rd-party mod…

…ules

Backport of commit f3c2a26 from mainline:

 - nginx-upload-progress-module v0.9.1  -> v0.9.2
 - headers-more-nginx-module    v0.30   -> 0.31
 - ngx-fancyindex               v0.4.0  -> v0.4.1 (bug #592464)
 - lua-nginx-module             v0.10.5 -> 0.10.6
 - nginx-rtmp-module            v1.1.8  -> v1.1.9
 - echo-nginx-module            v0.59   -> 0.60

Gentoo-Bug: https://bugs.gentoo.org/592464

Package-Manager: portage-2.3.0