Rename HTTP Handlers->Tasks
Rename HTTP Controllers->Handlers
Correct Indenting
New cpp-common ref
Markups - change BillingHandlerTask->BillingTask
Take latest cpp-common
Merge remote-tracking branch 'origin/dev' into Rename_Handlers_Branch
Merge pull request #89 from Metaswitch/Rename_Handlers_Branch

[Reviewer: Alex - Do not merge] Rename handlers branch