Making install_cli.php path independent by using config.php

Currently the script is hard-coded to the `<<SugarCRM DIR>>/Tidbit/*` location.
This change offers to have `config.php` inside `Tidbit/` folder with configured `$sugar_dir` variable.

This way you could customize the location of script.

You will need to copy `Tidbit/config.example.php` to `Tidbit/config.php` and change the `$sugar_dir` according to your need.