chore(deployment): added fig and related readme
chore(deployment:fig): added missing env vars
chore(sciprts): removed redundant script
chore(fig): updated readme and some env vars
chore(settings): made them compatible with docker/fig (ie consider blank vars as unset)
fix(superdesk: utils: env): added fallback value for a fallback_value :)
fix(superdesk: settings): moved 'env' helper inlini into settings
Merge pull request #349 from actionless/fig

chore(deployment): added fig and related readme
Merge pull request #376 from actionless/settings-compat

chore(settings): made them compatible with docker/fig
Merge pull request #377 from actionless/fix-docker-script

chore(sciprts): removed redundant script
[SD-1051] First Issue fixed.
Merge remote-tracking branch 'upstream/master'