Massive update:
gwt 2.6
  required fixing valuespinner - temporarily
appengine 1.9
java 1.7
first pass at pagination - with in-memory problems still
fix problem with trigger experiments not checking start date
re-enable public experiments (with pagination)
fix shortJsonify returning full definition
Cleaned up pagination.
Observe startdate for triggered experiments.
Pass new pacoProtocol header to differentiate old, non-paginating
clients from new 3.0 paginating clients (json results now possibly
include cursors and embed actual experiments in a "results" property in
JSON.