Update Database.php

prevent SQL Injection
Update Database.php

Remove unnecessary temporary variables and refactor the callback the use array function and prevent sql Injection
Update Database.php

Updated to Namespace and to PHP 5.4 code style
Update Database.php

added Exception handling for possible error
Update Database by adding a Mysqli escape method
Update Database.php
Add RuntimeException when the query are performed
Update Database.php
Removed Namespace
Bug fixed for the delete function
Added getMysqli Method
Merge pull request #1 from nyamsprod/master

Added SQL Injection prevention to Database class