Fixed cases for boolean vars with fixed weights / without weight variables

- Tested
- Multinomial is already handled
- ContinuousLR is still not supported to have fixed weight / no weight
variable
Fixed Chunking test by running integration tests one-by-one

Currently Akka has issues when running all integration tests at once.
We have two integration tests BiasedCoin and Chunking. As a dumb
solution, we run unit tests and different integration tests separately.
If any of them return a non-0 code, the test fails.
Add description in weight table
Merge branch 'hotfix-weight-table' of https://github.com/HazyResearch/deepdive into hotfix-weight-table
Comment out chunking test temporarily
use helper in SQLInferenceDataStore
cut chunking data size by half (for travis)
update Sen's writeback
Make temp file writable in chunking test
Update variable name, delete white spaces and dead code
Update variable name, delete white spaces and dead code
Merge branch 'hotfix-weight-table' of https://github.com/HazyResearch/deepdive into hotfix-weight-table
Update Chunking.scala

Changed header comments.
reduce chunking test data size
Merge branch 'hotfix-weight-table' of https://github.com/HazyResearch/deepdive into hotfix-weight-table
move id to the last column in dd_weights_
Delete unused test code
Add note about id for future developers
Update test sampler parameters
Merge pull request #145 from HazyResearch/hotfix-weight-table

Hotfix weight table, writeback, chunking test