eliminate expandable prop in favor of inConversation

src/components/conversation/conversation.vue

@@ -13,7 +13,6 @@
       :key="status.id"
       :inlineExpanded="collapsable"
       :statusoid="status"
-      :expandable='!isExpanded'
       :focused="focused(status.id)"
       :inConversation="isExpanded"
       :highlight="getHighlight()"

src/components/status/status.js

@@ -18,7 +18,6 @@ const Status = {
   name: 'Status',
   props: [
     'statusoid',
-    'expandable',
     'inConversation',
     'focused',
     'highlight',

src/components/status/status.vue

@@ -52,7 +52,7 @@
                 <a :href="status.external_url" target="_blank" v-if="!status.is_local && !isPreview" class="source_url" title="Source">
                   <i class="button-icon icon-link-ext-alt"></i>
                 </a>
-                <template v-if="expandable && !isPreview">
+                <template v-if="!inConversation && !isPreview">
                   <a href="#" @click.prevent="toggleExpanded" title="Expand">
                     <i class="button-icon icon-plus-squared"></i>
                   </a>