Fix build errors in BulkProvisioner
Remove linefeeds in the middle of subscription XML - otherwise BulkProvisioner can't parse it correctly
Firewall against _exists column being missing
Add support for generating homestead cache-only tables
Add _exists column when doing sstable bulk provisioning
Switch back to 64MB SSTables
Merge pull request #109 from Metaswitch/issue108

[Reviewe Andy] Fixes for broken sstable bulk provisioning