www/codeigniter: update 2.2.6 -> 3.0.3

• Update PORTVERSION, distinfo, and pkg-plist for 3.0.3
• Add LICENSE
• Fix CONFLICTS

Changes compared to CodeIgniter 2:

• The framework is released under the MIT license
• The database drivers have had extensive refactoring
• PDO is fully functional with subdrivers
• There is a new Session library
• There is a new Encryption library
• The unit testing has been beefed up, and code coverage improved
• PHP 5.4 or newer is recommended, but CI will still work on PHP 5.2.4

UPDATING:

• Add entry documenting the steps for updating a legacy site

Reference: http://www.codeigniter.com/user_guide/installation/upgrade_300.html

PR: 203403