Publish CI build notifications to IRC

See #86

.travis.yml

@@ -1,2 +1,14 @@
 language: java
 jdk: oraclejdk8
+
+notifications:
+  irc:
+    channels: chat.freenode.net#bitsquare.io
+    template:
+      - '%{message} (%{repository}#%{build_number}, %{duration})'
+      - '%{repsitory}/%{branch} %{commit} %{author}: %{commit_message}'
+      - '%{build_url}'
+    on_success: always
+    on_failure: always
+    use_notice: true
+    skip_join: true