Improve logging of HTTP connection errors
Discard incoming non-OPTIONS requests if queue is too large
Add latency statistics for HSS and XDM
Improve logging and retry behaviour on Homestead (and Homer) lookup failures
Remove rough overload control code (moved to an experimental branch
Don't enable ENUM lookups by default
Update README.md
Code review mark-ups
Merge pull request #208 from Metaswitch/issue191

[Reviewer: Mike] Don't enable ENUM lookups by default
Fixes #201 - try registration store lookup with supplied URI if HSS look-up fails
Merge pull request #211 from Metaswitch/issue210

[Review Andy] Fixes #210 - try registration store lookup with supplied URI if HSS look-up fails
Change connection pool recycle algorithm to always recycle a connection within +/- 20% of the target time
Merge branch 'dev' of github.com:Metaswitch/sprout into faster_scale_up
Merge commit '95a6ba06029f371ceb68f34959a54319ee4f5097' into http_latency_stats
Merge pull request #212 from Metaswitch/faster_scale_up

[Reviewer Matt] Faster scale up
Code review mark-ups
Merge pull request #215 from Metaswitch/http_latency_stats

[Reviewer: Alex] HTTP latency statistics
Merge up to latest dev code and do code review updates
Fix compile issues and UTs
Merge pull request #200 from Metaswitch/issue144

[Reviewer Rob] Issue144 - improvements to HTTP connection failure loggin