Add in regeneration of timer IDs. This also fixes: Invalid JSON being sent on replication, Corruption of JSON body on CURL requests and changes the clock to REALTIME where appropriate
Updates after test
Updates to timer store
Updates after review
Update cpp-common
Merge remote-tracking branch 'origin/dev' into sto721
Merge pull request #24 from Metaswitch/sto721

[No reviewer] Sto721