Merge pull request #3 from opencart-lite/core

Core changes
Merge pull request #5 from opencart-lite/core

Core global modified
Merge pull request #7 from opencart-lite/core

PDO
Merge pull request #9 from opencart-lite/core

PDO System fix
Merge pull request #11 from opencart-lite/core

Traits Controller & Model
Merge pull request #13 from opencart-lite/core

Registry Static
Admin fix for PDO and new struct core
Merge remote-tracking branch 'origin/dev' into dev
Merge pull request #16 from opencart-lite/dev

Dev