Development fig config

Rhyme partially intended.

USE: fig -f fig-develop.yml ...
Don't start web in development fig up

To that end added optional separate configuration keys for mongo
river. Now different servers' addresses can be passed to main app
and different to ES river.

Also added smallfiles and noprealloc CL options to mongod.
FIX: crash on draft without text applied

Story, question and answer
Merge branch 'empty-documents-validation'
Question assign - copy search val to new question

For easier addition of new questions.