[Fix osquery#2704] Various distributed code cleanups (osquery#2719)

Add .features and .summary meta commands (osquery#2695)

Fix Linux routes table inconsistencies (osquery#2684)

Efficiency improvements to processes table on Windows (osquery#2587)

Use TLSTransport HTTP client in aws_util (osquery#2299)

Clean up verbose logging for OS X kernel extension (osquery#2276)

Crashes table now grabs all register values (osquery#2243)

Use noexcept boost::filesystem overloads (osquery#2195)

Simplify watchdog limits configuration (osquery#2173)

Fix OS X kernel extension autoload (osquery#2151)