Added dec26 meetup demo
emacs tweaks
lower required mem for some py tests

Still fails on my windows, somebody is *forcing* a 32-bit JVM, as it;s
not on any obvious path - i only get 64bit JVMs from all shells, and
only 32-bit JVM when launched via python Popen.
Turn back on DRFtests, turned off by mistake
Fix debug printing for regression trees
Get explicit about max upper-bounds

being either Inclusive or Exclusive.  It's gathered Inclusive during
scoring, but used Exclusive when defining bin boundaries.
Merge branch 'master' of github.com:0xdata/h2o
Hunt down & kill a race with min/max
Change summary2 to cope with slice's enum vec inheriting domains and values from the origin vecs. This inheritance may have buggy implications in other algos.
Merge branch 'master' of github.com:0xdata/h2o
must not have pushed these