Add abstract_clock, manual_clock, chrono_io

Conflicts:
	src/beast/Builds/VisualStudio2012/beast.vcxproj.filters
Fix warning in chrono_io
Add std::hash <std::pair> specialization
Don't log StatsD messages to the console by default
Add io_latency_probe
Improved PropertyStream find and print routines
Fix Clang compile and link errors
Add std::make_unique
Tidy up for C++11, and fixes:
* Remove shared_ptr legacy support
* Add make_unique support for pre-C++14 environments
* Fix comparison bug in sqdb
* Use std::shared_ptr in a few places
Add ScopedPointer::reset
Use duration in insight::Event, add chrono_util
Fix PropertyStream overloads
Update project build requirements
* Add Visual Studio 2013 project file
* Update SConstruct for boost 1.55.0
Update Visual Studio 2013 project file
Add basic_seconds_clock, insight::Groups
Remove obsolete Visual Studio projects
Refactor IP::Endpoint
Change bassert to always call assert
Fix clang compile
Improved logging for insight stat packets