Allow RemoteSyslogChannel to be used again after being closed.
fix alignas specifier
add qualifiers for FPEnvironment in C99
Merge pull request #219 from lucas-clemente/patch-1

fix alignas specifier
improved NamedMutex/Event error diagnostics
mainly JSON tidy-up
added another ctor to WebSocket
Merge pull request #220 from lucas-clemente/patch-2

add qualifiers for FPEnvironment in C99
FPEnvironment, changed <math.h> to <cmath>
fix signed/unsigned warnings
updated CHANGELOG
updated release notes
network test socket buffer size fix for VS2010/Win7
Merge remote-tracking branch 'upstream/develop' into develop
Change HTTPCookie to support expiry times in the past.
Fix indentation.
Merge pull request #223 from karlr42/develop

I'll check and run it on other platforms/compilers before 1.5.2 release
code tidy-up
GH #224: building 1.5.1 on Windows for x64
Add unit test for opening/closing RemoteSyslogChannel