Add auth to import script
Add credentials helper for Examples and Specs
Add Digest Authenticator and Helpers

- Digest Authenticator
- UrlParts Helper
- MD5 Helper
- Update ExtractHeaders
- UpdateResponse Helper
Small tweaks

- Headers
- Cleanup
- Add http:// to specs
Format Authenticators
Merge pull request #31 from timhall/authenticator-updates

Authenticator updates