fix(grunt): make grunt server listen to 0.0.0.0

it was set to localhost only which doesn't work within docker image
feat(preferences): frontend logic for user preferences
fix(preferences): improve the code
wip(docker)
fix(docker)
Merge branch 'fix-connect' of github.com:petrjasek/superdesk-client into add-docker
readme: added info about docker
repo: added vagrant and according readme lines
feat(api): add resource.remove
Merge remote-tracking branch 'petr/fix-connect' into devel
Merge remote-tracking branch 'yauhen/add-vagrant' into devel
fix(styles): move medium editor styles to superdesk
fix(styles): authoring dashboard fix

+ center opened articles
+ remove plus button from opened articles
fix(styles): improve assignee box styling

improve assingee box
feat(tasks): Implemented picking tasks.

SD-730
Merge remote-tracking branch 'nikola/ui-update' into devel
Merge remote-tracking branch 'nikola/user-preferences' into devel
feat(workflow): send to action UI

html + css