Merge branch 'documentation/ansible_inventory_groups' of https://github.com/Cbeck527/packer into b-ansible-inventory-docs

Fix inconsistent spelling

Use --portcount on VirtualBox 5.x

Don't override packer build version with min_packer_version from template

Guard against uninitialized pointers in io.Copy in WinRM calls

Fix go version in docs

The current link 404's, but this fixes it.

Thanks to copyedt on Twitter: https://twitter.com/copyedt/status/620807196259958785

Fix interpolation in google compute image name

Use Rack::Protection

Fix other characters in docs displayed incorrectly

Fix character being displayed incorrectly in hashicorp ecosystem page

`(boolean)` is used in most cases, but `(bool)` is used in places.

I ran `find website/source/**/*.(markdown|md) | xargs sed -i 's/(bool)/(boolean)/g'`

builder/null: When using a Null builder, this error message is incorrect.