0.3.1 release: async pushes and better binary format

.idea/artifacts/kiloparsec_js_0_3_1_SNAPSHOT.xml

@@ -0,0 +1,8 @@
+<component name="ArtifactManager">
+  <artifact type="jar" name="kiloparsec-js-0.3.1-SNAPSHOT">
+    <output-path>$PROJECT_DIR$/build/libs</output-path>
+    <root id="archive" name="kiloparsec-js-0.3.1-SNAPSHOT.jar">
+      <element id="module-output" name="kiloparsec.jsMain" />
+    </root>
+  </artifact>
+</component>