Improves Manifest

- Adds manifest caching in /cache/manifests (divides by 2 the load time)
- Adds a security to manifest now stored in a php file which cannot be
open
WNote - Adds some check before sending a mail in handle_email
WController - Changes last update date - fixes #28
WNote - Uses $email var properly
Merge pull request #49 from Creatiwity/Manifest-Security

Manifest security - Fixes #28