Convert a path string to a JS code for an array
Example: preparePath('users.0.name') -> "['users', 0, 'name']"
@param {string} path
@returns {string}
@private
function preparePath(path) {
		var parts = path.split('.')
		parts = parts.map(function (part) {
			return numericRegex.test(part) ? part : '\'' + escape(part) + '\''
		})
		return '[' + parts.join(', ') + ']'
	}