Fixes issue 458 - allow S-CSCF URI to be configured
Merge branch 'dev' of github.com:Metaswitch/sprout into iss458
Correctly enable new scscf_uri option
Use shallow clones of pre-built headers
Fix handling of --alias parameter
Merge branch 'dev' of github.com:Metaswitch/sprout into iss458
Merge pull request #521 from Metaswitch/iss458

[Reviewer: Ellie] Iss458