Instructions for how to install Sublime Text 2 completions file.

I bet there is a "righter" way. But that's how it's working for me.

utils/editors/sublimetext2/README

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-zip threejs.sublime-package threejs.sublime-completions

utils/editors/sublimetext2/README.md

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+### How to install
+
+1. Compress `threejs.sublime-completions` into `threejs.sublime-package`.
+
+```shell
+zip threejs.sublime-package threejs.sublime-completions
+```
+
+2. Copy the compressed file into `Sublime Text 2/Pristine Packages`.