Change dir structure and rename user pref file

By removing the parent `Packages` directory Mac users can set up their local `Packages` directory as a Git repo. If it is a Git repo then any changes can be versioned easily - any (local) changes are tracked and anything that benefits the entire team can be pushed (and then pulled) down from the repo.

Instructions:
1. In your terminal, cd to your `Sublime Text 3` folder, e.g., `cd /Users/sgoldberg/Library/Application Support/Sublime Text 3`
2. Delete your `Packages` folder: `rm -rf Packages`
3. Clone down making sure to change the name of the folder (repo). As you're testing my work, you'll need to clone from my fork: `git clone git@github.com:stevegoldberg/VendaSublimeText.git Packages`. This will create a folder called `Packages` with the contents in it and set it up as a git repo.
4. Restart Sublime. All of the user packages should have loaded fine.
5. Create a blank HTML file and save it. After it's saved, test all the cool things that these preferences do: e.g., typing `html` and then tabbing, or the Venda tag autocomplete.