Change "Request::$current" -> "Request::current()" which seems more preferred.
Revise index.php for K3.
- remove IN_PRODUCTION and KOHANA constants (handled in Kohana::init() params).
- change PHP requirement to 5.3.3+.
- change error reporting (matches K3.3 recommendations).
- fix some minor formatting issues.
Revise save(), create(), update(), and delete() syntaxes for ORM models.
- remove id argument from delete() for Item, Task, ORM_MPTT, Tag, Group, User.
- revise save() for Tag, Task.
- split save() into save(), update(), and create() for Comment.
Remove unneeded $sorting definition in Item model.
Merge pull request #290 from shadlaws/fixes_20130415

Fixes 20130415