Installing latest version of MongoDB

cloned from Installing latest version of MongoDB

1. Registering the key to use the official mongodb apt repository
2. Update the package manager so it knows about the new repository
3. Install last version of MongoDB & some php tools to build the php mongo extension
4. Build the mongo extension
5. Register the mongo extension
6. Restart php5-fpm to let it use the extension

Voilà.
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