Fix a filename and pillar key issue

* Ensure `common.sls` references correct template filename
* Use `pillar.get(...)` for message_do_not_modify with default

Re-organize nginx formula files

* Re-organize according to http://docs.saltstack.com/topics/conventions/formulas.html#writing-formulas

Added the ability to build from source or package, with luajit2 and openresty

Proper dictionary lookup

Restructure according to new guidelines.

Added basic nginx layout with custom interfaces and logger