Add Travis-CI script to build and auto-deploy documentation

.travis.d/.gitignore

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+id-rsa

.travis.d/id-rsa.pub

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+ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCghPR0z4LB+TdSDYvdIiPbcRc9vmTaQpG/KR2XfHwZm4unGSB742q7A9LlFvk4nwfNDQuK22YUB77gNxBQRi1nTB+q+AZ4XzFZ3u/8+8al7wTvZZrL2spDzjkcidfuqcBSwluSzyohk4TGzic1Hx/GFV8qg7+TJUWG5xAkC460YG3QcGagbI9av5L+NeQjtiabO7HlYP8K+ayXTGpiFaJ00jGoOdIAJIIKtlJ9Yb7Gn8vSPPq/XD07GbqalK8wwfbF60Bpmh8G1+miXUFAZyh5b1PA4xisEaMLxuCRGHJUq04uT5GIu/KHbU6J9eqaMIOZtITtz4BuNi0lrUObJUxb cawka@cawkaMac.local

.travis.yml

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+language: java
+sudo: false
+jdk:
+  - oraclejdk8
+addons:
+  apt:
+    packages:
+      - oracle-java8-installer
+branches:
+  only:
+    - master
+script:
+  - mvn javadoc:javadoc -P javadoc
+after_success:
+  - ssh-keyscan -H $HOSTNAME 2>&1 | tee -a $HOME/.ssh/known_hosts
+  - openssl aes-256-cbc -K $encrypted_0464b08ce7d9_key -iv $encrypted_0464b08ce7d9_iv -in .travis.d/id-rsa.enc -out .travis.d/id-rsa -d
+  - mkdir -p ~/.ssh && mv .travis.d/id-rsa ~/.ssh/id_rsa && chmod 600 ~/.ssh/id_rsa
+  - rsync -arv --delete --progress target/site/apidocs/ $USERNAME@$HOSTNAME:/var/www/named-data.net/www/doc/ndn-ccl/latest/jNDN
+  # TODO: sync tagged versions