Get the URL of an asset. If asset hashes are added and one exists for
		the path, it will be appended as a query string.

		Args:
		  path (str): Path to the file, relative to your "assets" directory.

def get_asset_url(self, path):
		"""
		Get the URL of an asset. If asset hashes are added and one exists for
		the path, it will be appended as a query string.

		Args:
		  path (str): Path to the file, relative to your "assets" directory.
		"""
		url = self.root_url + '/assets/' + path
		if path in self.asset_hash:
			url += '?' + self.asset_hash[path]
		return url