make reusable Exporter component

src/components/exporter/exporter.vue

@@ -0,0 +1,20 @@
+<template>
+  <div class="exporter">
+    <div v-if="processing">
+      <i class="icon-spin4 animate-spin exporter-processing"></i>
+      <span>{{processingMessage}}</span>
+    </div>
+    <button class="btn btn-default" @click="process" v-else>{{exportButtonLabel}}</button>
+  </div>
+</template>
+
+<script src="./exporter.js"></script>
+
+<style lang="scss">
+.exporter {
+  &-processing {
+    font-size: 1.5em;
+    margin: 0.25em;
+  }
+}
+</style>