Resolve "Improve download of csv and fasta"

User is now aware that a download is occuring and errors are displayed when an error occurs on the backend.

Closes #139

Closes #134

frontend/src/views/genedetail/genedetail.html

@@ -6,7 +6,7 @@
     </v-toolbar>
     <v-alert
       v-if="notFound"
-      :value="true"
+      :value="notFound"
       type="warning"
     >
       <v-layout align-center>
@@ -14,7 +14,7 @@
         <v-spacer/>
         <router-link to="/">redirect to home page</router-link>
         <v-icon small class="ml-1">fa-home</v-icon>
-    </v-layout>
+      </v-layout>
     </v-alert>
 
     <v-card v-else class="blue-grey lighten-5">