Add a bunch of request/response examples

Added request/response examples for:

- Updating a template version
- Creating a new template
- Creating a new template version
- Send to a segment
- Get translation package
- Post translated strings

Cleaned up some formatting and fixed a typo too.
Fix per Brad's suggestions

Clean up il8n `.pot` example.
Merge pull request #19 from sendwithus/updated-docs-v2

Updated docs v2