Modified naming: udf_extractor -> json_extractor
Merge branch 'develop' of github.com:HazyResearch/deepdive into develop

Conflicts:
	examples/spouse_example/README.md
Automaticly choose linux/mac sampler
Added fill_sequence.sh into util
Fixed one test for assigning id
Updated NLP extractor for new ID convention; fixed spouse example accordingly
Rn ANALYZE after each extractor
Merge branch 'develop' of https://github.com/HazyResearch/deepdive into grounding1
fix ; in creating view
fix ; in creating view