Commented code, added some libraries and helpers, and more.

- Added Input library that cleans global variables ($_POST, $_GET, $_SERVER, $_COOKIE).
- Added Email library that allows to send emails on PHP.
- Added Text helper with some text delimiter functions.
- Added Debug helper with some useful functions.
- Added Time helper with the functions Timestamp_to_user_defined(), Now() and Date_info().
- Added a generic error page.
- Added a config file (hhvm.hdf) for HipHop Virtual Machine server.
- Deleted MyHelper.
- Adapted to the PHP coding standards.
- Added a license file (Apache 2.0).
- FINALLY the code is commented!!!