Updated feature: Mango v0.3.3

- New API additions
- API refactoring
Updated feature: Mango_Collection v0.4.2

- Added Mango_Collection::unsetOption
- Added Mango_Collection::safeUpdate
- Added Mango_Collection::safeRemove
Updated feature: Mango Reader
Updated feature: Fixed error mssages and PHPDoc
Updated feature: Minor fixes in PHPDoc