Breadcrumb component

[DeepDiver1975]

Following variants in usage shall be possible:

1. Default rendering items

<oc-breadcrumbs :items="items" divider=">"></oc-breadcrumbs>

Items are plain objects with the properties:

• text: the text which is displayed in the breadcrumb
• to: the vue router link
• disabled: if true the breadcrumb is not clickable

2. Render a given template

<oc-breadcrumbs :items="items" divider=">">
  <template slot='items slot-scope="props">
    <oc-icon name="ready"/><span>{{ props.item.text.toUpperCase }}</span>
  </template>
</oc-breadcrumbs>

For implementing the styling use UiKit breadbrumb classes https://getuikit.com/docs/breadcrumb

[DeepDiver1975]

refs #62