*Fragments class modified: RegisterFragment method.

*LoginHandler class Modified: New containsName method that checks the
key of the hashmap to see if the user name is taken

*WelcomeContainer class modified: textfields are checked in the
registerClicked method, as of now only password and username are
checked.
Text fields and rewording

text fields are now cleared when the fragment is left.
reworded some of the error messages when checking usernames and
passwords for registration
WIP account management and account classes

Static account manager with access to account objects owned by users.
Subject to change, just thought I'd get it out there
More wip account stuff and admin activity

Separate fragment container for account related things.
Admin activity to display all usernames when admin is logged in.
Admin Activity

dynamically creates buttons for each registered username. still working
on reseting/deleting usernames/passwords
Admin Activity

Adds delete button when a username is clicked on.
Displays usernames in alphabetical order.
Agenda 2-18

Moved agenda folder
Added deposit system sequence diagram
Added Registration System Sequence Diagram
Updated Sprint Backlog
Organized Documents folder
WIP DB Helper
Sync with master