LB-8: Tageswoche livedesk:mobile issues (IOS)

fixed default theme.
revert LB-56 : Add the source key to the Source(superdesk-source) model
Made ffmpeg the default thumbnail generator

We still have issues with GraphicsMagick not working on different systems
LB-306 : Change names of users and live blog in default demo database
LB-306 : Change names of users and live blog in default demo database
LB-349: Share functionality does not work on default embed templates

Embed now has default theme.
LB-433 : Twitter search: urls in a tweet

Done
LB-425: Integration with SMS Gateway
* some simple attempt
LB-425: Integration with SMS Gateway
* adjusting, testing
LB-425: Integration with SMS Gateway
* services for feeds
LB-508 : Autopublish - chaining blogs plugin
LB-425: Integration with SMS Gateway
* adjusted
Merge branch 'devel' into lb-425-sms-gateway
LB-446: SMS source plugin
* some trying
LB-446: SMS source plugin
* sms pushed into posts; feed type saved as source
LB-446: SMS source plugin
* adjusted; taking time stamp fronm flsms, saving phone number in post, meta
LB-446: SMS source plugin
* adjusted on params
LB-446: SMS source plugin
* dependency adjusted
LB-508 : Autopublish - chaining blogs plugin
Merge pull request #43 from mugurrus/chain-blogs-autopublish

Chain blogs autopublish