Merge pull request #181 from HazyResearch/hotfix-test_fastseq_assign

Merge pull request #181 from HazyResearch/hotfix-test_fastseq_assign 

Fix handling of empty variable relations and add test for it.

This merge has also the side effect of updating the mindbender release to 0.1.2, due to the way the hotfix branch was created (branched from develop instead of master). This is not a big deal, and actually an ok change.
Merge branch 'hotfix-schemachange'

Avoid messing up with user schema
Merge branch 'hotfix-schemachange'

Avoid creating index on psql
Merge branch 'release-mindreader'
Merge pull request #185 from HazyResearch/master-cv-c

hotfix -- sampler compatability

Fixed a Linux sampler compatibility issue
Changed link to Hogwild paper
Merge pull request #188 from HazyResearch/hotfix-docs

Updated link to the Hogwild paper
Removed symbolic links to data folder
Added data validation in run.sh and setup_database.sh

Prompt user to download data in the script if the data files do not
exist.
Bug fix in pipeline

The dependency in the pipeline has a bug. ext_clear_table must be
dependency for ext_people.
Fixed typos in data file names in walkthrough
Added documentation to compute recall script
Updated docs in improvement section
Updated extra section
Updated data downloading specification
Merge pull request #189 from HazyResearch/hotfix-docs

Hotfix docs
Slightly change improvement section structure
Merge pull request #190 from HazyResearch/hotfix-docs

Slightly change improvement section structure
Merge branch 'master' into develop