Make the test suite work with latest Vagrant configuration

Znc 1.4

Adjust cipher suite assertions to match what's currently reported by the
server.

Remove WebTests.test_znc_http test since ZNC web interface isn't exposed to
the Internet.

(Tested only with Debian 7 VM from the Vagrantfile)

ZNC 1.4 uses a new section within the configuration file to specify
password hash and salt. This requires adding a new Ansible variable
'irc_password_salt'.

Also update the README file to reflect above changes.

Also see: http://b.wardje.eu/2011/12/znc-failing-to-connect.html

Merge pull request #270

Merge pull request #271

Merge pull request #269

Also makes code slightly terser.

Update the Vagrantfile so that it is possible (and easier) to spin up Debian
7, Ubuntu 12.04 and Ubuntu 14.04 VMs. Although Vagrant allows spinning up all
of them simultaneously, there may be conflicts assigning host names and IP
addresses.

This Vagrantfile also enables the vagrant-cachier plugin (if installed) to
cache downloaded packages across subsequent runs of the same VM.

Running "vagrant up" will bring up only the Debian VM since it is the
officially supported Linux distributions. Ubuntu 12.04 and Ubuntu 14.04 must
be started explicitly by running either "vagrant up precise" or "vagrant up
trusty".

Subsequent runs of wallabag's playbook result in the 'install' directory being
recreated, (after the "Clone wallabag" step) kicking wallabag's first time
setup procedure.

With this patch we automatically remove the 'install' directory if wallabag's
configuration file appears to be in place before cloning the repository.

Solves the chicken-or-the-egg problem of generating a dovecot and znc salted
password hash without already having dovecot and znc installed. That is, people
are installing sovereign typically do not have dovecot and znc installed and
have no way of generating the required salted password hashes.

Python 3 standard library generates SHA512-CRYPT salted password hashes by
default so it is particularly convenient for configuring dovecot:

    python3 -c 'import crypt; print(crypt.crypt('password'))'

For ZNC, the required command is slightly more verbose.

Merge pull request #268

Wallabag 1.7.1 fixes a couple of security vulnerabilities, adds ePUB
export and more.

For a list of changes since 1.6.1b see:
- https://www.wallabag.org/blog/2014/05/29/1-7-epub-multi-users-available/
- https://www.wallabag.org/blog/2014/07/15/wallabag-1-7-1/

Merge pull request #265

Merge pull request #264

Use a single Vagrant base box since the one made by Box-Cutter supports both
VirtualBox and VMware (Workstation and Fusion) hypervisors.

Fix monit ZNC monitoring

The 'fuse-utils' package doesn't exist on Ubuntu 14.04 and is marked as a
transitional package on both Debian 7 and Ubuntu 12.04 that installs the
'fuse' package.

Since Debian 7 is the officially supported distribution we can safely
switch to install 'fuse' instead of 'fuse-utils' and we also gain
compatibility with Ubuntu 14.04.

Merge pull request #262

Merge pull request #259

Compress Postgres backup file

Compress Postgres backup file

Remove TODO in favour of Github issue queue

Backup postgres to .sql without needing restart of service & Increase cipher suite level

Merge pull request #254

This change set builds collectd from source and configures it in one of
the following ways:

- If Librato credentials are present, collectd will be configured to
send data points to Librato using the collectd-librato plugin.

- If no Librato credentials are present, collectd will be configured to
write RRD files locally (/opt/collectd/var/lib/collectd/rrd by default).

Merge pull request #252

My selfoss logs were using 10GB of space because they weren't being rotated properly.

Use available gitolite3 package on Ubuntu trusty

apache sites: Wrong ownership and filename

Merge pull request #244

Merge pull request #234