update core codemirror

Signed-off-by: Chris Granger <ibdknox@gmail.com>
Merge branch 'master' of github.com:Kodowa/Light-Table-Playground
fix menu for the latest nw

Signed-off-by: Chris Granger <ibdknox@gmail.com>
fix menu for the latest nw

Signed-off-by: Chris Granger <ibdknox@gmail.com>
fix the skins and themes to no longer use css variables as they've been removed in the latest versions of chromium. You can now use node-webkit 10+

Signed-off-by: Chris Granger <ibdknox@gmail.com>
Merge branch 'master' of github.com:Kodowa/Light-Table-Playground
linux_deps.sh: If 'which curl' fails, exit with its return code.
linux_deps.sh: re-use downloaded LightTableLinux*.gz, clojure-plugin

* download LightTableLinux*.tar.gz only if it doesn't exist and always
  verify its sha1 checksum.
* store clojure-plugin as a git-submodule and clone it only once. Then
  update it with git pull --rebase
linux_deps.sh: buildVer=0.6.7