Merged unnecessary stdafx.h with stdafx.hpp.
Merge pull request #226 from murrekatt/develop

Merged unnecessary stdafx.h with stdafx.hpp.
CMake: Generate opentxsConfig.cmake so we can use find_package in server and other applications that use the opentxs library
Update minimum required CMake Version to 2.8.11 (needed for CMakePackageConfigHelpers module)