Added strong rules to glm2.
Updated strong rules (correct expansion of beta between different lambdas (with different number of active cols).
few bug fixes in glm2 strong rules
Fixed line-search with strong-rules. Potential AIOB when comparing betas of different sizes. Added explicit expansion to full size beta (for now) when comparing gradients/betas in line-search.
Strong rules update.
Merge branch 'master' into glm_strong_rules

Conflicts:
	src/main/java/hex/FrameTask.java
	src/main/java/hex/glm/GLM2.java
GLM2 strong rules. Few fixes after merge with master.
strong rules update.
strong rules update.
PP-57: add a hash to Vecs and Frames and use them in the UniqueId for a Frame.
strong rules update
PP-57: add a test to check that the hash for a parsed file is deterministic.
strong rules update
Bugfix stale model selection view when model list predicate is cleared.
Make secondary parameters 'always-visible' if they have differences.
Comment out broken GLM call from preload script
PP-60 + PP-62: get test_model_management.py running with check_sandbox_for_errors.
PP-60 + PP-62: get test_model_management.py running with check_sandbox_for_errors.
PP-60 + PP-62: get test_model_management.py running with check_sandbox_for_errors.
Change pytest location