Plain Text Password Authentication

Added basic password checking functionality

Modified:
MySQLAccess.java - add findUser(String email) to query for users based
on unique email

LoginServlet.java - add password checking and set attributes "success"
indicating whether action completed and "reason" indicating reason for
failure if any to be forwarded to asp

index.html - remove background color styling from body and add it to
styles.css

login.jsp - display the results of the login or user creation action,
if successful then redirect to display.html; also apply styles.css

users.jsp - apply styles.css