NOJIRA: Updated travis build to be able auto-push javadocs

This pull contains the needed changes for the current travis build to auto-push javadocs to the gh-pages branch.

Travis will use a shell script to move the javadocs over to the current directory and then push then over using a secure encrypted oauth token, generated for the jasig/cas project:

```bash
#
# Generate the OAUTH-TOKEN atd at https://github.com/settings/applications
# Install travis: gem install travis
# Login to travis: travis login
# Encrypt the token: travis encrypt GH_TOKEN=[OAUTH-TOKEN] -r Jasig/cas --add env.global
#
```

Here's an example:
http://mmoayyed.github.io/cas/current/javadocs/index.html

There may be a few other changes needed to get this fully functional. For now, this is just a baseline pull for the initial review.

Note that the oauth-token generated above applies directly to Jasig/cas and no further changes may be needed. (Although the token is specific to my account)