Added ProjectLeader functionalities and Project Group requirement for
logging in.

What currently works:
*Logging in with a group
*Listing all users in said group

What doesn't work:
*Changing roles of users in group
Merge branch 'master' of https://github.com/ada10lgu/etsn05.git

Conflicts:
	BaseBlockSystem/src/LogIn.java
	BaseBlockSystem/src/servletBase.java