bump imagemagick version for builds
fix mirror URL so we can grab archived releases too when building PHP
Apache/2.4.10
enable mod_remoteip for Apache
ngx_http_realip_module for Nginx
Nginx/1.6.0
fix binary buildpack branch in README
disable HHVM on cedar-14 for now
fix PHP extensions not getting installed when using both HHVM and PHP
fix imagick builds using wrong version
clean up and simplify some error handling
fix bogus error on empty composer.json
Merge remote-tracking branch 'forked-from/master' into ext-ssh