* Merge from Debian. Remaining changes: (LP: #1388621) - debian/patches/ubuntu-branding.patch: add Ubuntu branding (refreshed). - debian/rules: Drop from -O3 to -O2 to work around a build failure. - d/{control,rules,nginx-core.*}: add new binary package for main, nginx-core, which contains only source-tarball-included modules and no third-party modules. - debian/tests/control: add nginx-core test. - debian/control: drop luajit from Build-Depends as it is in universe. * debian/control: * Remove nginx-naxsi* from nginx-core and related package stanzas, as the naxsi packages have all been dropped. * Remove reference to nginx-naxsi from nginx metapackage description * debian/index.html: Modify included index.html file to have Ubuntu branding, Ubuntu bug reporting tool references, and a link to the Launchpad bugs page for the nginx package.