Features: Installation script

[Sreeja Kamishetty]

parent issue: #161
These are features need to implemented.

• database migrations directly through script
• Document how to change url from example.com/engelsystem/public to example.com/engelsystem/ issue #213
• install.php should be redirected only once for one database.

[Sreeja Kamishetty]

@hongquan
Can I create a index.php file in the root folder of engelsystem which redirects to engelsystem/public/index.php file to resolve the directory listing problem.

[Nguyễn Hồng Quân]

Replied via #211

[Sreeja Kamishetty]

Fixed here #211