Do not overwrite /etc/apt/sources.list, fucker.
In install-globaleaks.sh, use full-length fingerprint.

* Use --keyserver option
* Use full fingerprint to strengthen security.
Update bower/npm libraries versions
Added complete fingerprint also during PGP key fetching
Remove debian/changelog.

This commit is to avoid to keep an outdated debian/changelog file on master and
devel branches. Instead, release/{ubuntu,debian} branches shall all have still
this file.