Update README.
Merge pull request #92 from fdelapena/master

Update README.
Update Doxyfile, use svg and other tweaks.
Fix typo in README
Merge pull request #93 from ChrisOelmueller/typos

Fix typo in README
Use javadoc style code comments for platform specific files.
Use javadoc style code comments for files (a to f).
Implement Alt+F4 on non-Windows desktops (closes #51)
Merge pull request #94 from fdelapena/master

Implement Alt+F4 on non-Windows desktops (closes #51)
Update Doxyfile to 1.8.3.1
Use javadoc style code comments for game_* files.
Use javadoc style code comments (h to u and z).
Use javadoc style code comments (Window classes).
Use javadoc style code comments (Scene classes).
Fix typos.
Miscellaneous code comment tweaks.
Fix doxygen warnings.
Fix reported typos.
remove empty destructors
fix name layout