Mailer Class and functionality

Using the JavaMail API we created an object which will send emails using the
Google SMTP server via the team gmail account (struct.by.lightning@gmail.com)
These emails consist of the following text:
Header: WPI-Suite: Planning Poker
Body: A Planning Poker session has begun.

The header and body are hard-coded in, as well as the sending email and
password, but these can be changed relatively easily by adding them to
the constructor arguments.

Recipient emails can be added either individually, through the addEmail()
method, or via an array of email addresses with the addEmailArray() method.

Notes: You may need to add the JavaMail library to your build path for both PlanningPoker and WPI-Suite to prevent compilation errors.

Signed-off-by: Alec Thompson - ajthompson@wpi.edu
               Long Nguyen - lhnguyenduc@wpi.edu