* provider/aws: Remove hardcoded https from the ecr repository
When the ECR resource was created, we hardcoded the repository URL to
start with https://
This was a mistake as all interaction with the repository now must
include a replace function for the https:// to "" for this to be usable
We need to note this change in the backward incompatibilities
```
% make testacc TEST=./builtin/providers/aws TESTARGS='-run=TestAccAWSEcrRepository_' ✭
==> Checking that code complies with gofmt requirements...
go generate $(go list ./... | grep -v /terraform/vendor/)
2017/01/20 14:37:36 Generated command/internal_plugin_list.go
TF_ACC=1 go test ./builtin/providers/aws -v -run=TestAccAWSEcrRepository_ -timeout 120m
=== RUN TestAccAWSEcrRepository_importBasic
--- PASS: TestAccAWSEcrRepository_importBasic (20.46s)
=== RUN TestAccAWSEcrRepository_basic
--- PASS: TestAccAWSEcrRepository_basic (18.77s)
PASS
ok github.com/hashicorp/terraform/builtin/providers/aws 39.251s
```
* Update ecr_repository.html.markdown
