Using generic name 'tooltips'

[vairavlaksh]

Since generic name 'tooltips' for the directive is used here, it conflicts with some other packages having tooltips as their directive name too. In our project we are using this directive to display tooltip. Since one other component we are using for graph also has a directive named 'tooltips' it is going for a toss and our app is not working as expected. So please use any suffix or prefix before directive name('tooltips') or export a configuration to configure the name of the directive by the user.