LilyDev version 4.0 released

[Federico Bruni]

Hi all

I've just uploaded the new LilyDev iso to Github:
https://github.com/fedelibre/LilyDev/releases/tag/v4.0

Please test it. If it's working fine we should update the CG.

Thanks
Federico


Notable changes:

- Upgrade to **Debian 8 Jessie** and **live-build 4**.
- **Interactive Git setup** at first startup to create user's 
`~/.gitconfig` and download LilyPond git repositories (which were 
previously included out-of-date in the image).
- Installation simplified through preseed.cfg: no need to choose a 
repository mirror or a root password (defaults to httpredir.debian.org 
and sudo).
- `.bashrc` improved: terminal prompt shows git branch, plus other 
fixes.
- Live option removed from the boot menu.
- Add new lilypond dependency: fonts-texgyre.
- Add a few packages: less, gedit, geany, spice-vdagent (to enable 
clipboard sharing in QEMU).
- Chromium has replaced Iceweasel (a.k.a. Firefox) as default browser.

You can check the integrity of the file with this command:

   $ md5sum lilydev-4.0-i386.hybrid.iso
   9da792275907b44cd6b98f67b64a33f5  lilydev-4.0-i386.hybrid.iso