Rename the deb to packagename_version_architecture.deb

This is the standard way to name a debian package according to section
7.3 of the Debian GNU/Linux FAQ
(http://www.debian.org/doc/manuals/debian-faq/ch-pkg_basics.en.html#s-pkgname)
Update the dependencies of the Debian package

the package should really depend on java-runtime and ruby-interpreter.
The dependency on jre is obvious. The ruby interpreter is needed as long
as we package the ruby command line in the same package.
Merge pull request #34 from daisy-consortium/debian_rename

Rename the deb to packagename_version_architecture.deb