resolves #312

- add sys.upgrade task
- add upgrade plan
auto install system service mgr
version bump
added upgrade module as dependency
updated lib with new planner-related functions
resolves #58

- increase logging verbosity for tests
- use npmlog
- remove string, string-format, sync modules
- refactor planner
0.9.74
Merge pull request #313 from tjwebb/issues/312/upgrade-plan

upgrade plan
removed string-format require from xt.install
cat xtuple-server.log after failure in ci
Merge pull request #315 from tjwebb/planner-error-verbosity

Planner error verbosity
increased test logging verbosity
cleanup spec index
0.9.75
use stable instad of prev to revert node versions
Merge pull request #318 from tjwebb/mocha-log-verbosity

Mocha log verbosity
Merge pull request #317 from tjwebb/issues/316

use stable instad of prev to revert node versions
corrected dependency issue in lib
lib version
only add postgres deb entry if not already there