Moved around some directories and updated build scripts.
Updated build scripts for the restructured uri so that it compiles on Linux/GCC 4.7
Restructured the message framework, passing tests on Linux/GCC 4.7.
Restructured logging code into a new subdirectory.
Updated build script references.
Removed obsolete files; updated build scripts so that the include paths are all correctly set again.
Adjustments to build scripts in order to compile on MSVC 2012.
Merge pull request #179 from glynos/restructure_dirs

Restructure dirs
Fixed missing perfect forwarding opportunity.
Refactored thread_pool from the utils sub-directory (and namespace) into concurrency.
Removed checks for c++0x as they are no longer used.
Moved http subdirectory; includes version.hpp and constants.
Removed http code from old subdirectory.
Moved mime to a separate subdirectory.
Merge pull request #181 from glynos/restructure_dirs

Restructure dirs