Bugfix in GLMGrid.

KV Store changed and now stores deserialized objects so objects obtained from KV  are now shared and not private.
GLMGrid contains sort of it's array of keys (to order models according to their goodness), which conflicted with the update as new models were computed.

Changed it so that it now sorts cloned array of keys.
Minor update of GLM. Cross validation used to refer to the wrong model key (the first cross-validated model).
Minor update of cross validation. The confusion matrix of the first cross-validated model contained was shared with the overall validation (and thus contained all rows).
Minor GLMTest update.
Merge branch 'master' of github.com:0xdata/h2o