Use the "NPM WebJar" instead of "classic WebJar" for CodeMirror
Use the "NPM WebJar" instead of "classic WebJar" for CodeMirror

The NPM WebJar is easier to deploy. As soon as the CodeMirror author
publishes a new version to NPM, anyone can deploy it to WebJars in one
click. In contrast, the classic WebJar requires a WebJars team member to
manually update and deploy it, which usually takes longer [1].

Also update version to 5.13.4, which was a trivial fix to include the
LICENSE file and brought no functionality change.

[1]: http://www.webjars.org/

Change-Id: I9328f371aa99cac7e81b3f8a442d6582275ad3a7

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