Change to CassandraStore API
Pull in latest cpp-common
Merge branch 'dev' of github.com:Metaswitch/homestead into memento-alarms
Merge pull request #168 from Metaswitch/memento-alarms

Change to CassandraStore API
Fix up UT breakages
Merge pull request #171 from Metaswitch/memento-alarms

[No reviewer] Fix up UT breakages