Bugzilla::Milestone - Bugzilla product milestone class.
    use Bugzilla::Milestone;
    my $milestone = new Bugzilla::Milestone(
        { product => $product, name => 'milestone_value' });
    my $product_id = $milestone->product_id;
    my $value = $milestone->value;
    my $milestone = $hash_ref->{'milestone_value'};
Milestone.pm represents a Product Milestone object.
new($product_id, $value) Description: The constructor is used to load an existing milestone
              by passing a product id and a milestone value.
 Params:      $product_id - Integer with a Bugzilla product id.
              $value - String with a milestone value.
 Returns:     A Bugzilla::Milestone object.
bug_count()Description: Returns the total of bugs that belong to the milestone. Params: none. Returns: Integer with the number of bugs.
check_milestone($product, $milestone_name) Description: Checks if a milestone name was passed in
              and if it is a valid milestone.
 Params:      $product - Bugzilla::Product object.
              $milestone_name - String with a milestone name.
 Returns:     Bugzilla::Milestone object.