google-fluentd version 1.4.0

Major changes:
* Upgrade fluent-plugin-google-cloud to 0.3.0.
  * Support Application Default Credentials
  * Support setting custom GCE metadata from config.
  * Improve severity level support.
  * Add structured logging support.
* Upgrade upstream td-agent to 2.2.0 and fluentd version from 0.10 to 0.12.

config/projects/google-fluentd.rb

@@ -8,7 +8,7 @@
 description "Google Fluentd: A data collector for Google Cloud Logging"
 
 install_dir     "/opt/google-fluentd"
-build_version   "1.3.2"
+build_version   "1.4.0"
 build_iteration 1
 
 # creates required build directories