LB-57 : Read key from Source model and use it for post to external sources

Almost done
LB-57 : Read key from Source model and use it for post to external sources

Done
LB-349: Share functionality does not work on default embed templates

default theme for embed
LB-349: Share functionality does not work on default embed templates

CSS fixed
LB-360 : Install instruction missing steps
LB-361 : Clickable button with no action

Done
LB-306 : Change names of users and live blog in default demo database
NR-817 : Article Plugin
LB-314: Make CSS consistent through live blog pages

Users page table fix + minor top menu fix
Merge branch 'devel' of dev.sourcefabric.org:superdesk into devel
LB-260 : Increase the character limit for Link-type Posts

Changed the error message to display more details.
Merge remote-tracking branch 'origin/devel' into devel
LB-350: Blog source UI

Added provider for liveblog
LB-350: Blog source UI

liveblog renamed to chain.
Ignore egg-info.