.fire.inc - > .inc
Allow an amount to be given to MetricStore.inc
Merge branch 'feature/issue-166-change-fire-inc-to-use-last-aggregation-and-the-kv-store' of github.com:praekelt/vumi-jssandbox-toolkit into feature/issue-166-change-fire-inc-to-use-last-aggregation-and-the-kv-store