bootstrap-vue 0.12.3 on Node.js NPM

[tabs] fixes #222 (Pooya Parsa) - 40bc4f8
[collapse] calculate height without extra div #223 (Pooya Parsa) - cec0465
[cards] use global alignment by default (Pooya Parsa) - 10f982f
[NavItem] Change the component type to 'button' if 'href' or 'to' props are not defined (cynecx) - 1518011
[Collapse] Smoother collapse animations (jinzhixin) - f9aecb6
[Tabs] Improve dynamic tab changes handling (Pooya Parsa) - f00f999