LB-758: Configure Blog -> User Comments -> Switching between states has problems on Saving

Reset events on config. Fix blogUrl in comments tab. Save comments
settings on save and close (was only in save button handler).
Merge pull request #254 from petrjasek/lb-758-config-blog-error

Lb 758 config blog error
LB-843: When chained blog source is shown one of chained blogs should be selected

Fixed.
Update user.py

Also give deleted users.
LB-842: When a chained blog provider is deleted, the already selected blogs still appear on chained blog source

Add OriginURI to chained blog source.
Merge pull request #256 from petrjasek/lb-842-source-origin-uri

Lb 842 source origin uri
Merge pull request #255 from eozan/LB-843

LB-843: When chained blog source is shown one of chained blogs should be selected
LB-842: When a chained blog provider is deleted, the already selected blogs still appear on chained blog source

Fix OriginURI to be external url of the provider.
Merge pull request #258 from petrjasek/lb-842-source-origin-uri

Lb 842 source origin uri