Cleaned up code for ContinuousLR factor (not supported yet)

Code for ContinuousLRFactor are temporary and not supported yet.
Should not appear in the master branch.
Fixed a build warning
Skipped chunking test on GreenPlum

Now `make test` calls both test/test_gp.sh and test/test_psql.sh, and
the latter will call chunking test which has permission problems on GP.
To make `make test` work on GP, we skip chunking test on GP in a hacky
way.
Fixed a non-terminating bug in sampler

When sampler throw PermissionDenied error, (+x not set), DeepDive will
not terminate. Fixed this issue.
Update sampler for Mac to support -q/--quert
Reduced test output by using -q in sampler
Fixed a test bug when there is NULL in inference result

When highest bucket has 0 incorrect values, it has a NULL in the result
table, which leads to a test failure since x / (x + NULL) = NULL.

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Fixed Akka non-terminating bugs

DeepDive have suffered from non-terminating bugs. These types of bugs
are because exceptions are thrown out of DeepDive.run, but the Akka
actor is not shut down. We have been trying to capture these bugs by
catching them everywhere and run a Context.shutdown, but the universal
solution is catching any type of exception and shut down the Akka actor
whenever an exception occurs.

Added a try-catch block in DeepDive.run, and shut down the system when
exceptions are thrown. This fixes config parsing failures and
unpredictable exceptions.
Fixed learning rates for tests

Used previous learning rate, which is 0.5
Merge branch 'hotfix-clean-continuousLR' of github.com:HazyResearch/deepdive into hotfix-clean-continuousLR
Fixed a mistaken change in test
Add an integration test for Akka non-terminating issue

Added `Brokentest.scala`, an integration test to detect non-termination.
Fixed non-termination for invalid inference rules
Added notes and discussions into comments for future reference
Merge pull request #172 from HazyResearch/hotfix-clean-continuousLR

Bug fixes for termination of akka. While here, remove some dead code.