Do not use display_override hook for CodeIgniter support.
PHP 5.3 compatability
Add Hook_Clockwork::addDataSource method for registering more datasources in CodeIgniter.
Merge branch 'master' into codeigniter

Conflicts:
	Clockwork/Support/CodeIgniter/Hook_Clockwork_Register.php

Retain PHP 5.3 compatability.
Move CodeIgniter classes so they are more PSR-0 compliant.
Update README.md to reflect changes in CodeIgniter support.
Merge pull request #47 from pwhelan/codeigniter

More CodeIgniter improvements.