DocumentView V1.0.2

1、Add multi-language support，English and Chinese as default。If you want to use other language，use：

       DocumentHelper.setMessageProvider(new MessageProvider() {
            @Override
            public String getMsg(MessageType type, Object... formatArgs) {
                int resid = parseResid(type);
                return context.getString(resid, formatArgs);
            }
        });

2、remove obfuscation warnings