Update stats tools for the new homestead stats
Move homestead-prov stats to port 6667
Revert bad change to the C-version of the stats tool
Move homer/homestead-prov stats to port 6667, and render the homestead-prov stats as the right type
Rework ruby stats collector to allow subscriptions
Add the ability to specify what ports to pull stats from
Merge pull request #372 from Metaswitch/new_homestead_stats

[Reviewer: Matt][From: Alex] Update stats tools to cope with homestead stats.
Take new cpp module
Merge pull request #375 from Metaswitch/new_module

[No reviewer] Take new cpp module
libmemcached.mk shouldn't depend on libevhtp.mk
Merge branch 'fix-libmemcached-deps' into dev
Merge branch 'dev' of github.com:Metaswitch/sprout into expire_reg