Bump version number to 0.1.0-rc.4
Add links to the project's GitHub page and to the Sphinx documentation (in the README).
Fix submodule URL.
Add CMake option to tell CMake whether the Sphinx documentation should be included in the distutils package or not.
Add CMake option to tell CMake whether the target to generate the Sphinx LaTeX documentation should be included in the target 'sphinx' or not.
Add CMake option to tell CMake whether the target to generate the Doxygen documentation should be included in the target 'doc' or not.
Add execution permission to shell scripts.
Merge branch 'hotfix-0.1.0-rc.4'