force ::text conversion for weight command
Merge pull request #18 from feiranwang/develop2

Fix test issues, clean up code
Fix import
Merge branch 'feiranwang-develop' into develop
multinomial
Merge branch 'develop' of https://github.com/HazyResearch/deepdive into develop2
change multinomial examples
add predicate field in FactorFunctionVariable, add equal predicate parsing, add cardinality table, support with/without equal predicate