PPR and RTR code review mark ups
Add logging
Fix cache logging bug
Merge branch 'logging' into dev
Final mark ups for PPR and RTR (and up to date cpp-common)
Resolve merge conflicts
Fix all build breakages caused by blurgh with cpp-common
Merge pull request #15 from Metaswitch/tsk2233

Review MATT: PPR and RTR code review mark ups
Merge remote-tracking branch 'origin/dev' into stats_and_throttling
Fix duff merge to Makefile
Complete integration with latest master
Fix UTs