Add Travis CI setting for auto generating and deploying html

Add Travis CI setting file for auto generating html.

Add deploy_key.enc for auto deploy.
This key is sample key for deploying sample web site.
In this sample, the deployed web site can be checked at
http://hatohol.blue.skydetector.net.

Change unoconv calling option in gen.py for old unoconv supplied by
Ubuntu 12.04 in Travis CI.

I used following site method for using ssh, scp in Travis CI.
http://blog.eiel.info/blog/2014/02/18/github-push-from-travis/
For changing deploying destination, replacing deploy_key.enc file and ssh, scp command option are needed.
Setting $SERVER_KEY and rewriting "secure" section by travis command is also needed for deploying.