Add clara-utils gem
Small Vagrantfile refactoring
Set Clara environment variables
Use relative directories for installation and logs
Mount directory with Clara sources
Add bundler to list of dependencies

Required by Clara Web App.
Add extra provisioning steps for projects

If the project needs to run extra commands in order to install
dependencies (in its local directory), those commands can be added to
the yaml configuration file. Vagrant will execute them as the last
provisioning steps.
Add Clara Web App extra provisioning

It's needed to install all the gem dependencies.