Updated log in page and SQL for dev-issues-#1

-renamed and minor changes on php files
-created log out php
-<<log in>> form sends password and username for search in DB
-check_login.php searches DB and returns
user details as globals (everyone can use)
Merged updated master
merged updated master , fixed issues
Added error messages and log out button
fixed 'log out' displaying while not logged
Merge branch 'Dev-Issues-#1'

Conflicts:
	css/login.css
	inc/footer.php
	inc/nav.php
	login.php
fixed issue with merging dev-issues-#1