First pass on docs
Update local roaming to mobile twinned
Merge pull request #6 from Metaswitch/rename_localroaming

[No reviewer] Update local roaming to mobile twinned
Updates after review
Tidy up build
Merge pull request #2 from Metaswitch/gemini_docs

[Reviewer: Matt] First pass on docs
Change Metaswitch submodule refs to ClearwaterCore