skipString = function() {
				var quote = content.charAt(pos);
				if (quote == '"' || quote == "'") {
					while (--pos >= 0) {
						if (content.charAt(pos) == quote && content.charAt(pos - 1) != '\\') {
							break;
						}
					}
					return true;
				}

				return false;
			}
Search for nearest CSS rule/section that contains
given position
@param  {String} content CSS content or matched CSS rules (array of ranges)
@param  {Number} pos     Search position
@return {Range}