Added CodeIgniter 2.2.0
Updated README with the CodeIgniter version.
Added app.yaml
Fixed issue with the CodeIgniter user guide.
Added missing php_sapi_name function
Added demo URL.
Merge pull request #1 from sasidhar/feature/codeigniter-2.2.0-base

Feature/codeigniter 2.2.0 base
Added codeigniter-gae-app version.
Merge branch 'release/0.1'