Add xmlrpc_uri for ul_blog option
Merge branch 'unstable' of github.com:xbot/UltraBlog.vim into unstable

Conflicts:
	doc/UltraBlog.txt
Add categories auto-completion feature.
Merge branch 'unstable'

Conflicts:
	doc/UltraBlog.txt
	plugin/UltraBlog.vim
	plugin/ultrablog/commands.py
	plugin/ultrablog/util.py