map jk to Esc - insert mode mapping

[cocodrino]

Hi, sorry for the noob question but it's possible map the keys jk for change from insert to normal mode??..thanks!...by the way, seems than the configuration file changes in the latest lightable release......

[cldwalker]

While this is possible with vim options thanks to #35, it was removed in the subsequent CodeMirror release. The way to do this will be with insert mode keybindings once we can upgrade CodeMirror - see #45