Implement Cobra CLI tooling, Viper config tooling (#336)

* start pulling out + replacing urfave and config

* replace many many instances of config

* move more stuff => viper

* properly remove urfave

* move some flags to root command

* add testrig commands to root

* alias config file keys

* start adding cli parsing tests

* reorder viper init

* remove config path alias

* fmt

* change config file keys to non-nested

* we're more or less in business now

* tidy up the common func

* go fmt

* get tests passing again

* add note about the cliparsing tests

* reorganize

* update docs with changes

* structure cmd dir better

* rename + move some files around

* fix dangling comma

vendor/github.com/subosito/gotenv/.travis.yml

@@ -0,0 +1,10 @@
+language: go
+go:
+  - 1.x
+os:
+  - linux
+  - osx
+script:
+  - go test -test.v -coverprofile=coverage.out -covermode=count
+after_success:
+  - bash <(curl -s https://codecov.io/bash)