jshint fix
After first time hitting the end of questions, don't try and load any more.
add indexes to foreign keys in answer table
Merge pull request #143 from askaway/feature/foreign_key_indexes

Add indexes to foreign keys in answer table
Merge pull request #142 from askaway/loading-stops-once-end-reached

Loading stops once end reached
Update schema
Merge branch 'master' of github.com:askaway/askaway into db-controlled-weight

Conflicts:
	db/structure.sql