Introduce ruby classes for environment and template
Move exec() into template
Make template.exec() output in realtime
Make virtualbox builder headless
Introduce template.output_path()
Merge branch 'master' of github.com:cargomedia/vagrant-boxes into aws-boxes
Merge branch 'issue-20' into aws-boxes

Conflicts:
	debian-6-amd64/default.json
	debian-6-amd64/plain.json
	debian-7-amd64/default.json
	debian-7-amd64/plain.json
Merge branch 'issue-20' into aws-boxes

Conflicts:
	debian-6-amd64/default.json
	debian-6-amd64/plain.json
	debian-7-amd64/default.json
	debian-7-amd64/plain.json
Restructure shell provisioners a bit, add second aws builder
Use proper AMI id for us-east
Use BuildName for artefact path
Streamline naming
Adjust s3 bucket
Implement upload task
Use aws sdk to upload to s3
Remove unnecessary process.wait
Remove unnecessary requires, fix "plain"-matching for tests
Make s3 upload public
Adjust docu
Use strings for popen's ENV