[Development environment] serve exhibitv2 from the local development environment and not from api.grid5000.fr

Do not constrain rake version to have same rake version as pulled from rubygems during Vagrant provisioning

[Vagrant] add a magic ssh config file so as to be able to ssh from the Vagrant machine using the ssh-agent on the host

[Vagrant] add an http proxy to the vagrant box so as to be able to work on the ui with real data for OAR, except for one site where the data will come from the local service, that will connect as reader to the OAR database. Update the README.md file with extended instructions, in particular on how to use the tunneling task with rake to create the proper tunnels to make it all happen

[Vagrant] Point Vagrantfile to a new version of the vagrant box. Users of previous version will need to destroy their debian-jessie-x64-puppet_4 box or upgrade it to benefit from the update

Remove extra gems for the development environment, as this makes the development environment behave differently than the production environment

[Capistrano] remove packaging task, now moved to lib/task/packaging.rake to run using rake in the vagrant box

[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