This was breaking the docs :(
conf load errors downgraded to warnings

The lack of a config file can eventually trigger ImportError, which
(among other things) breaks our docs build. It's also really rude.
This is now a warning, which prints a nice error message without
breaking everything.
Merge pull request #614 from seandst/docs-fix

conf load errors downgraded to warnings
DB queries
Update configure navigation to work
Merge pull request #613 from mfalesni/some_db_queries

DB queries
Added ScriptBox element

ScriptBox() class added for customization template page
Added some extra logging for flash messages
Added page_controls_exist() method
Simple docs fix
Added entire suite of page models for PXE

* PXEServer()
* CustomizationTemplate()
* SystemImageType()
Added tests for PXE

* Added PXE Server CRUD tests
* Added Customization Template CRUD tests
* Added System Image Type CRUD tests
* Added RHEL template file