Merge branch 'software-keyboard' of git://github.com/jamalex/ka-lite int...

This fix the issue for https://github.com/learningequality/ka-lite/issues/382
I didn't make install button to be external link, because we had a branch of install_wizard that doesn't use wiki. I think install page shouldn't fully rely on wiki, If we can't get install wizard pull in 0.10, we can probably copy those installation wiki content in KA-Lite tamplate