Update Registration.php

Replace mysqli functions by PHP PDO functions in all database calls.

Replace all direct calls to "new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME)" by the function "private function databaseConnection()"
This function check if database connection already opened, create connection if needed and return true or false (if false, error message is added to error string of the class)
Merge pull request #154 from devplanete/patch-4

Update Registration.php : PDO support
Merge pull request #168 from devplanete/patch-6

Update Login.php - PDO support
added PDO changes
1-minimal code cleaning / PSR-styling
Update Registration.php

I have cleaned codes and refactored the class with an eye on PSR-0/1/2 code conventions
Merge pull request #174 from devplanete/patch-7

Update Registration.php - Code cleaned & refactored with PSR-0/1/2 code conventions
removed strange borders in content box
Merge remote-tracking branch 'origin/develop' into develop
Cookie/Remember me feature
Cookie/Remember me feature for 2-advanced
Cookie/Remember me feature
Cookie/Remember me feature
Update not_logged_in.php

Cookie/Remember me feature forgotten file
Merge pull request #178 from devplanete/patch-9

Cookie/Remember me feature for 2-advanced
Merge pull request #179 from devplanete/patch-10

Cookie/Remember me feature forgotten file
infos on installing PHP 5.5
infos on installing PHP 5.5
Update Login.php improve Remember Me cookie feature
Update config.php improve Remember Me cookie feature