Don't put yard artifacts into version control
Use Dir.pwd as Devtools.project_root

This is less brittle than relying on callstack
locations and should be fine for our needs.
Move shared spec examples to shared/spec/shared
Ship spec/support/ice_nine_config with devtools

This adds a dependency on ice_nine to devtools.
Given that ice_nine has no runtime dependencies
itself, this is acceptable.
Call Devtools.project_root from Devtools.init

This is a leftover from 0617549f7 which removed
Devtools.extract_call_path
Adjust flay score