add EqualPredicate to edge
add isEvidence to variables and equalPredicate to edges in Protobuf
remove file writer locker (we're single-threaded)
Merge branch 'develop' of github.com:dennybritz/deepdive into develop
use java sampler
Specs for new code. Make them pending.
Add cardinality to grounding.
Multinomial
MN example and Mac sampler