Update CircleCI configuration to use Orbs

Use the Lambdaisland orbs (https://github.com/lambdaisland/meta) and CircleCI
2.1 "commands" option to really clean up the CI config.

Author: plexus

.circleci/config.yml

@@ -1,13 +1,39 @@
-version: 2
-jobs:
-  build:
-    docker:
-      - image: circleci/openjdk:9
+version: 2.1
+
+orbs:
+  kaocha: lambdaisland/kaocha@dev:first
+  clojure: lambdaisland/clojure@dev:first
+
+commands:
+  checkout_and_run:
+    parameters:
+      clojure_version:
+        type: string
     steps:
       - checkout
-      - run: curl -O https://download.clojure.org/install/linux-install-1.9.0.375.sh
-      - run: chmod +x linux-install-1.9.0.375.sh
-      - run: ./linux-install-1.9.0.375.sh --prefix `pwd`
-      - run: curl -sL https://deb.nodesource.com/setup_8.x | sudo -E bash -
-      - run: sudo apt-get install -y nodejs
-      - run: bin/clojure -A:test -m kaocha.runner && bin/clojure -A:test-cljs
+      - clojure/with_cache:
+          steps:
+            - kaocha/execute:
+                args: "--reporter documentation --plugin cloverage --codecov"
+                clojure_version: << parameters.clojure_version >>
+      - kaocha/upload_codecov
+
+jobs:
+  java-11-clojure-1_10:
+    executor: clojure/openjdk11
+    steps: [{checkout_and_run: {clojure_version: "1.10.0-RC2"}}]
+
+  java-9-clojure-1_9:
+    executor: clojure/openjdk9
+    steps: [{checkout_and_run: {clojure_version: "1.9.0"}}]
+
+  java-8-clojure-1_8:
+    executor: clojure/openjdk8
+    steps: [{checkout_and_run: {clojure_version: "1.8.0"}}]
+
+workflows:
+  kaocha_test:
+    jobs:
+      - java-11-clojure-1_10
+      - java-9-clojure-1_9
+      - java-8-clojure-1_8