Pass 'pubDate' to metaWeblog

[Nie, Jason]

metaWeblog released 0.2.0 and support 'pubDate' field now. Please update.
This field is really useful for migration of blog.
:-D

[biaobiaoqi]

Thanks for reminding us. We'll check it soon.

[biaobiaoqi]

I've made some changes in my repo.
I used cnblogs to test my code and the result is the implementation of metaweblog in cnblogs is different from the standard one, which make the pubtime unavailable.
http://www.cnblogs.com/biaobiaoqi/services/metablogapi.aspx#Post
http://cyber.law.harvard.edu/rss/rss.html#ltsourcegtSubelementOfLtitemgt

I'll make some in-depth study of this problem later.

[Nie, Jason]

cnblog's api URL is changed to:
http://rpc.cnblogs.com/metaweblog/username