Merge pull request #45 from ThuThreeFour/userLogin

changed validation of user credentials, login and logout session. And changed home.html to home.php in home.php, writeJson.php, and validateRegistartionForm.js
Made home.php work with employeeDatajs.js
Merge pull request #46 from jacob-nappi/userLogin

Made home.php work with employeeDatajs.js
changed css to homepage, added comments to all code written by me