GLM2 update. Added gradient tests of convergence to inner ADMM LSM solver and to IRLSM solver, also added line-search.
Merge branch 'master' of github.com:0xdata/h2o

Conflicts:
	src/main/java/hex/glm/LSMSolver.java
GLM: disabled line-search for gaussian and tweedie(for now).
GLM2 fix. Only setGLM2 fix: do not set beta for the first iteration to beta0, leave it null (some families need social start to converge, for others it's not necessary).
Merge branch 'master' of github.com:0xdata/h2o