Customize Travis notifications.

Signed-off-by: Daira Hopwood <david-sarah@jacaranda.org>

.travis.yml

@@ -7,3 +7,14 @@ before_install:
 install: true
 before_script: python misc/build_helpers/show-tool-versions.py
 script: python setup.py test --reporter=timing
+notifications:
+  email: false
+  irc:
+    channels: "chat.freenode.net#tahoe-lafs"
+    on_success: always # for testing
+    on_failure: always
+    template:
+      - "%{repository}#%{build_number} [%{branch}: %{commit} by %{author}] %{message}"
+      - "Changes: %{compare_url} | Details: %{build_url}"
+    use_notice: true
+    skip_join: true