glm2: Added assert tot make sure glm2.complete() is called only once.
glm2: inner solver over relaxation param tune up.
Merge branch 'master' of github.com:0xdata/h2o
GLM2: fixed few corner cases related to producing only null model (either all given lambdas >= lambda_max or lambda_search=true and nlambdas=1).
returned params turned public to protected

GLMRandomTest: few fixes to make it work (and without the need to make glm2 params public).