Travis can deploy the rubygem on tagged builds.

This should make it easier to release from the github website interface,
especially when we're just pulling in a set of pull requests or doing some
quick inline fixes.

.travis.yml

@@ -1,10 +1,16 @@
-language: ruby
-rvm:
-  - 1.9.3
-  - 2.0.0
-  - jruby
-script: "bundle exec rake specs:assemblyinfo specs:albacoremodel specs:attrmethods"
-bundler_args: --without=wiki
-notifications:
-  email: false
-gemfile: Gemfile
+language: ruby
+rvm:
+- 1.9.3
+- 2.0.0
+- jruby
+script: bundle exec rake specs:assemblyinfo specs:albacoremodel specs:attrmethods
+bundler_args: --without=wiki
+notifications:
+  email: false
+gemfile: Gemfile
+deploy:
+  provider: rubygems
+  api_key:
+    secure: c8WYx8M7i68fZzucth/eI7kj0OX55f6te5Toz88HhDRYdycJ7xu6GJBErOGQBK+26cLnu2sfi//TJXOBayCm7mluTcNSoQMrYalm9s5+oCNyNKbMCZtRZ/kYqHZY4cvOobqKeTTrTJH5puD3PUFbCqat3s4HKrQUjCthfd6ZUeY=
+  on:
+    tags: true