CentOS 7 + Bug fixes

- The FedSSO side of the installer now supports CentOS 7​​
- Fticks is now bundled with the installer and the Maven dependency has been removed
- Tomcat has been replaced with Jetty as the container for Shibboleth​
- Upgraded from OpenJDK 1.6 to Oracle JRE 1.7
- Upgraded MySQL connector from 5.1.32 to 5.1.34
- Fixed pre-flight check and eduroam installer behaviour when installer_interactive='n' (#30)