Updates Vagrantfile to be compatible with the new syntax
Adds GithubProvisioner::Repository#sync_issues!

This method syncs the entire list of issues of a project.
It main issues will be for development and in case a web
hook is broken and some issues are missing in MGMT.
Lists only open issues

Adds an open_issues methods to Project to fetch
only the open issues. Now only the open issues are
listed in the project's page
Adds JS & CSS compression for Rails 4
Updates rails to 4.0.0.rc1