Updating bulk provisioning doc to include information about generating users for SIPp stress.
Merge pull request #18 from Metaswitch/bulk_prov_docs

{Reviewer: Matt} Updating bulk provisioning doc to include information about generating u...
Correcting Github information and link to install instructions and adding Project Clearwater overview
Merge pull request #27 from Metaswitch/docs_corrections

[No review required] Correcting Github information and link to install instructions and addin...