REST API compatibility test.

The test is filled by REST API calls and their arguments used by
Python/R client code.
The test verifies that tests are using correct arguments published
by Java code.
REST API calls invoked from R added.

Minor changes:
 - disabling assertion

FIx of python params:
 - Prediction has prediction parameter (not predict)
 - Fix of RF parameter: class_weight should be class_weights
 - Fix of unknown 'stratify' parameter for RF
 - Fix of unknown 'doPrint' parameter passing to summary view
 - Fix of unknown 'ignore' parameter passed to PCA view
 - GLMGrid parameter beta_epsilon should be beta_eps
 - GLM has no parameter expert, only expert_settings
 - GLM typo in parameter threshold (should be thresholds)