Add C#, D and Julia languages into matrix.

fixes https://github.com/travis-ci/travis-ci/issues/3016

# Julia
![screenshot-localhost 5000 2014-12-11 03-27-26](https://cloud.githubusercontent.com/assets/193936/5388146/0d9f9610-80e6-11e4-9346-49863c12cce1.png)

# D
![screenshot-localhost 5000 2014-12-11 03-27-06](https://cloud.githubusercontent.com/assets/193936/5388147/0db28414-80e6-11e4-8837-def16878d795.png)