configure httpd authorization

- Add _settings_authentication_tab.html.erb
consolidate match_groups implementations
add httpd authentication
Fix typo in variable name :flushed:

Fixes bug introduced in 379e99a in PR https://github.com/ManageIQ/manageiq/pull/120
https://bugzilla.redhat.com/show_bug.cgi?id=1086015
Merge pull request #32 from kbrock/external_auth3

External auth3
Merge pull request #122 from Fryguy/fix_ui_vm_summary_2

Fix typo in variable name
Automate model restructure code adjustments.

Minor pathing adjustments and expose platform category to aid the
 cloud/infra navigation.
Initial pass of the Automate model restructure.