aws_network_acl: return error if protocol is invalid
command: Run validation before asking for input. Fixes #602
terraform: return errors for interpolations
terraform: Check module config for resource instead of state
Update CHANGELOG
terraform: fixing test case
helper/schema: TypeMap computed should mark diff as cmputed
terraform: Fixing issue with computed maps
Merge pull request #631 from snehaso/network_acl

aws_network_acl: return error if rule protocol is invalid
Revert "helper/schema: TypeMap computed should mark diff as cmputed"

This reverts commit b73078c6705bee3c2afa87cc49416ce7bdcfe42d.
CHANGELOG updates
enabled cross zone load balancing
doc for cross zone load balancing
added vpc tenancy argument
added tags for aws_network_acl
Merge pull request #635 from snehaso/cross_zone_lb

[AWS]  enabled cross zone load balancing
Merge pull request #637 from snehaso/vpc_tenanct

[AWS] added vpc instance_tenancy
Merge pull request #638 from snehaso/tag_for_acl

[AWS] added tags for aws_network_acl
First release of a provider for CloudStack

Of course not all resources are covered by this first release, but
there should be enough resources available to handle most common
operations.

Tests and docs are included.
website: Document the atlas provider