corrected removal of travis key
Avoiding unnecessary warning message during cache copy

`cp` emitted "are the same file" messages due to our hardcoding
of the STACK env var to "". this is a band-aid, which should be
completely addressed when we establish our own STACK convention
in cf.
Add ruby 2.1.2 and 2.1.3 to dependencies

[Finishes #79742234]