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/spf13/viper/watch.go

@@ -0,0 +1,11 @@
+// +build !js
+
+package viper
+
+import "github.com/fsnotify/fsnotify"
+
+type watcher = fsnotify.Watcher
+
+func newWatcher() (*watcher, error) {
+	return fsnotify.NewWatcher()
+}