- Moved template header files to the Include directory.
- Added templates ToyMatrixConfig.cmake.in and
  ToyMatrixConfigVersion.cmake.in for generating config files.

CMakeLists.txt:
- Added version information to be exported to a config file.
- Exporting include directories to a config file.

UnitTests/CMakeLists.txt:
- Changed dirs from Src/ to Include/ for the dependency specification
  in the add_executable() command.

UnitTests/testtoymatrix.cpp:
- Changed include directories from Src/ to Include/

.gitignore:
- Ignoring config files outputs.