Change "server_http_host" --> "server_name" in comment module.
- Change field name from "server_http_host" to "server_name"
- Change column name in installer, update to version 8, revise install.sql
- Revise akismet module to match.  HTTP_HOST is optional for Akismet service,
so changing to a different optional field shouldn't cause any issues.
- Revise g2_import module to match.
Remove other references to HTTP_HOST, replace with SERVER_NAME as applicable.
Move Gallery::ready() call from bootstrap to index.
Revise Theme class to use Request::$initial->uri() instead of kohana_uri
Revise checking the override query in the Theme class.
Remove MY_Input and its unit test.  Purifier has adopted its functionality, and
we no longer need to keep it around for refernce.
Move init of Session after I18n in bootstrap (needs to have __() defined first).
Replace all remaining uses of Input::instance()->get().
- use Request::$current->query().
- use Arr::get() if a default value is needed.
Replace all remaining uses of Input::instance()->post().
- use Request::$current->post().
- use Arr::get() if a default value is needed.
Replace all remaining uses of the Input class.  All gone!
Tweak a few Input replacements - use typecasting instead of Arr::get() where applicable.
Fix typo in Model_user: "group" --> "groups"
Merge pull request #276 from shadlaws/misc_fixes_20130408

Misc fixes 20130408