Fix linux runtime dependency installation

Fix for adobe/brackets#4720

* Copies chromium install scripts to symlink `libudev`, `libnss3` and `libnspr4` locally into `/opt/brackets/` then set `LD_LIBRARY_PATH` to use the symlinked libraries
* Creates a new `brackets` wrapper script that is copied to the staging folder `pacakge-root/opt/brackets`
* Creates a new symlink `/usr/bin/brackets` to point to `/opt/brackets/brackets`
* Update dependencies to match `google-chrome` 28

I've uploaded a 64-bit package for testing here https://github.com/jasonsanjose/brackets-shell/releases/tag/0.30.0-8781. I tested this on a clean ubuntu 13.04 64-bit VM and did not get any `libudev` or `libplc` errors.