fixes wrong spice JS referenec

changed include tag to js-require Fixes file not precompiled issue in production.
Remove .DS_Store file
Removed unnecessary script related to SElinux
fixes missing assets files
more minor fixes around asset pipeline changes

1. put back needed icons for settings editing
2. fixed incorrect js syntax after dropping jrails.js
fixes #2371 - removed iconv - causing deprecation notice - block in require: iconv will be deprecated in the future, use String#encode instead
addes missing taxonomy asset
Small typo in foreman-config output
fixes #2376 Update migrations to match new rails3.2 paths
fixes #2153 - add trusted_puppetmaster_hosts setting to permit puppetmaster access

Connections to fact + report upload and externalNodes will be permitted from
any host listed in the trusted_puppetmaster_hosts setting, bypassing the
requirement for a registered smart proxy.

Setting model updated to support empty arrays for values and defaults.