Pick CKEditor version from package.json without using node

[mlewand]

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This means that we now need to have Node.js installed in order to build the CKEditor. This is a pain, especially if you build the CKEditor on a Continuous Integration server and you need to ask your infrastructure team to install yet another tool on all the CI agents. I would rather use grep, or perl, or an environment variable, or parse the JSON using Java, rather than adding a dependency on Node.js for such a small thing.

As noted by our user it would be better if we don't rely on node to pick the version as it adds extra dependency to deal with.

I think that grep would be a nice alternative. Since the script is in bash, we can assume it has the regular linux env binaries around.

Other details

Node-based detection was initially introduced in #572.