add encrypted ssh key

.travis.yml

@@ -1,9 +1,19 @@
 language: ruby
 rvm:
 - 2.3.1
+before_install:
+- openssl aes-256-cbc -K $encrypted_6059a4f451fd_key -iv $encrypted_6059a4f451fd_iv
+  -in id_rsa.enc -out .ssh/id_rsa -d
 
 install:
 - bundle install --without development
 
 script:
+- bundle exec nanoc check elinks
+- bundle exec nanoc check ilinks
+- bundle exec nanoc check stale
+- bundle exec nanoc check mixed_content
 - bundle exec nanoc
+
+after_success:
+- bundle exec nanoc deploy --target public