This role is considered equal if it is a Role whos getValue() is equal
to this object's getValue().
Do not use commons-lang EqualsBuilder, since this class will be
deployed to sakai's shared/lib.
See Also:java.lang.Object.equals(Object)
Returns a String description of this Role.
Do not use commons-lang ToStringBuilder, since this class will be
deployed to sakai's shared/lib.
a String description of this object.