changed bucket name in bucket-policy.json file

need to update s3 bucket policy, changed bucket name in bucket-policy.json file

Update README.md

added work in progress note to readme

Merge pull request #109 from abaird986/python

Module 1 modification to use public S3 bucket instead.

fix typo.

clarify replacement string.

Merge pull request #91 from aws-samples/abaird986-typo-patch

Typo fix.

Merge pull request #84 from benjipotter/python

Changes for approval of #84

Added Amazon CloudFront

Re-add the creation of the service-linked-role

Updating arch diagram for module 7