PION-1315: Added dump file generation on unhandled exception (Windows)
https://github.com/cloudmeter/pion/issues/24

Added BOOST_SYSTEM_NOEXCEPT for compatability with Boost 1.54
Updated ChangeLog & bumped version to 5.0.4
added cmake build to pion
Added NO_DEFAULT_PATH to FindLog4cplus.cmake so that cmake doesn't
fail when log4cplus is missing
Test file for previous checkin
Merge branch 'PION-1315' of git://github.com/vshcherbakov/pion into develop
PION-1315 added process_tests.cpp to Xcode project
Added process_tests.cpp to autoconf Makefile.am
https://github.com/cloudmeter/pion/issues/27

if lost connection in http::writer::send_more_data() then return immediately
after calling the finished handler (thanks magnum@github)

renamed flushContentStream() in http::writer to flush_content_stream()
fix header parse state