14.04 upgrade

This pull request upgrades the Roundware system to run on Ubuntu 14.04LTS Trusty Tahr. 12.04 LTS support is removed. There are really only minor changes as far as the Roundware setup/install is concerned, which is why I decided it was best to get this upgrade out of the way ASAP.

The only relevant changes are the package names, the switch to `avconv` since it's in the repos, and the addition of `.conf` to the apache virtualhost filename.

This pull request fixes #150 and unblocks #152.