Fixing indentation in apps/frontend/modules/plugin
Add a Vagrantfile and provisioning so one could run the forge with only "vagrant up"
Fixing indentation in ForgeGitHub class and ForgeForm class
Fixes #7 - Use curl instead of file_get_contents for the GitHub API

PluginAddStepForm::fetch was still using file_get_contents while the
ForgeGithub class was already using curl.
Fixes #7 - Also fix step 5 where the package.yml and README.md are fetched from GitHub
Merge: Fixes #7. Change file_get_contents to curl (with UA string).