install the doc and mkspecs files under a share subdir
add instructions for installing with the CMake buildsystem
install to default location only if CMAKE_INSTALL_PREFIX isn't specified
on the command line
fix cmake buildsystem for building with testing on.
add CMake option to force building against Qt4, even if Qt5 is found.
also document CMake options in the Install-cmake.txt file
install doc and mkspec files into the share subdir
install the forwarding class headers
install 2 headers that were missing
comment out the forwarding class headers install since those don't exist
except when build with the autogen buildsystem
version is 1.3.0
fix typos
Merge pull request #46 from winterz/master

CMake buildsystem fixes