Bugfixes in glm and parser:

1.  In the newly added force String in parser, there was a missing case when column idx is oob (row is longer than expected) which cause AIOB and failure to parse. Fixed by assuming all job idxs to be strings (they will be dropped anyways.)

2. GLM was expanding response variable in case of enum output, which caused all ys to be 1.

3. updated ui to enforce only == or != case predicate when response var is enum.
Merge branch 'master' of github.com:0xdata/h2o