Add config paths to config file

[alichtman]

These need to be easily customizable, so it makes sense to put them in the config file. Model this just like the dotfiles and dotfolders.

At the end of the day, the config should look like this.

{
    "backup_path": "/Users/alichtman/Desktop/Development/projects/shallow-backup/test",
    "dotfiles": [
        ".shallow-backup",
        ".bash_profile",
        ".zshrc",
        ".vimrc",
        ".pypirc",
        ".gitconfig",
        ".bashrc",
        ".profile"
    ],
    "dotfolders": [
        ".vim/",
        ".ssh/"
    ],
    "gitignore": [
        "dotfiles/.ssh",
        "packages/",
        "dotfiles/.pypirc"
    ],
    "config_mapping": {
		"Library/Application Support/Sublime Text 2/Packages/User/": "sublime_2",
		"Library/Application Support/Sublime Text 3/Packages/User/": "sublime_3",
		"Library/Preferences/IntelliJIdea2018.2/": "intellijidea_2018.2",
		"Library/Preferences/PyCharm2018.2/": "pycharm_2018.2",
		"Library/Preferences/CLion2018.2/": "clion_2018.2",
		"Library/Preferences/PhpStorm2018.2": "phpstorm_2018.2",
		".atom/": "atom",
	},
    "plist_mapping": {
		"Library/Preferences/com.apple.Terminal.plist": "plist/com.apple.Terminal.plist",
	},
}

Once this is done, backup_paths_temp.py should be removed from the refactoring branch.