Preserve Supported header in send_request
Don't add gruu if it's already there
Merge pull request #88 from Metaswitch/supported_hdr

Reviewer AMC: Preserve Supported header in send_request
Update documentation
Wording changes
Merge pull request #89 from Metaswitch/iss84

[Reviewer: Andy] Update documentation
Update gemini live tests
Merge branch 'master' of github.com:Metaswitch/clearwater-live-test into sto1001
Updates after review
Merge pull request #90 from Metaswitch/sto1001

[Reviewer: Alex] Sto1001