Travis CI: build config validation & execution order (#788)
Travis CI: build config validation & execution order (#788)

* Travis CI: Fix build config validation issues and organize yaml sections into execution order.  Also simplify by using `$HOME/bin`

* travis_retry the wgets
https://docs.travis-ci.com/user/common-build-problems/#travis_retry
cobrateam/splinter,cobrateam/splinter,cobrateam/splinter