[development environment] Update the default config to use a live OAR database made available through tunneling

[Vagrant] Update the developpment.pp file so that build dependencies of gems with native gems are made available out of the box

[Vagrant] Support of puppet 4 with vagrant 2.7.x seems difficult. Put a minimum requirement on the version of Vagrant to be used

[jessie] Cleanup the Gemfile so as to remove comments raom previous specification and version fixing that where probably no longer needed. Tested correct by running the unit tests

[jessie] The latest version of bundler sees our Gemfile.lock as being corrupt: seems linked to bundler issue #4147, that should be solved with the version pulled on Jessie but is not for us. Fix the version until this is investigated further.

[ruby2.1] It seems that in ruby 2.1 Time.parse("Fri Mar 13 16:24:20 2009 +0000")==Time.parse("Fri Mar 13 16:24:20 2009 +0100") ! Update the test to circumvent the change in hueruistics used by parse

[Jessie] update Vagrantfile and puppet recipes to be able to provision a debian 8.2 VM with no errors

[wheezy] update blather using code (config/initializers/jabber.rb) to properly handle disconnects. Tested live

[Vagrant] Updating provisionning recipes and configuration so that the vagrant box can be used as development box

[Wheezy] make the minimal updates to gems to use versions that compile on wheezy despite -Werror=format-security default behaviour by the gcc version used by wheezy (update blather, eventmachine, nokogiri), while keeping .gemspec files compatible with the native version of reubygems (downgrade autotest).

[Vagrant] Update vagrant instruction to stay compatible with older versions og vagrant while handling the removal of the insecure key promoted by recent versions