Added constants for mysql connect
Modified messages array
Database connection and existence checkout
Modified data input variables for mysql connection
Set up mysql form data input
Set up mysql data output
Deleted unnecessary values from  array
Changed table existence mechanism
Deleted unneccesary connection variables
Modified error mesage in add_record case
Removed unneccesary check and fixed first query
Modified mysqli_connect to drown out the error message
Merge pull request #8 from Zotoff/mysql

Switched questbook to work with mysql database