[#104] mv Backbone's topic to mixin.
[#104] add basic MandalaActionsBar component.
[#104] fix serialization in BackboneTopic mixin; don't create global
[#104] pass topic model to InputMandala as prop
[#104] don't create duplicate models on mixin level
[#104] Make <MandalaActionsBar/> interact with <InputMandala/>
[#104] add styling to <MandalaActonsBar/>
[#104] don't pass topic model into <MandalaActionsBar/>; use mixin to determine opinion's presence
[#104] rm global variable
[#104] fix patching topic
[#104] pass href as second argument