Check if image already exists before doing anything else on GCE.

Remove bucket_name from GCE config.

Fixes #1732. Forgot to do this in 23c947ac.

This fixes #1729.

Use an index loop as range loops over copies, not references

Upload VMX to ESX5 after editing

post-processor/vagrant: check if vagrantfile_template exists

added ssl_verify_mode parameter to chef-client provisioner

change ordering of ssh connection IP for amazon. fixes #1559

Use DigitalOcean image ID for artifact Id()

Test for user variables in vagrantfile_template [GH-1125]

Parallels: Fixed issue #1667

Update the getting started docs with Amazon changes

The AMI that was previously listed before this change no longer exists.