Updated Gem dependencies.

Per policy. Also cleaned up commented-out repo references which should
now be findable via the project Wiki.

* `flog` and `flay` have problems building from Github repos; fallen
back to defaults until figure out fix or gremlins Go Away;
* `metric_fu-Saikuro` now happy from default/latest tagged Gem.

RSpec: 767 examples, 0 failures (but see Issue #87)
RuboCop: 152 files inspected, no offenses detected