refactor(commands): separate commands and its core into two folders (#32)

- I think it would be better if one for commands only, one for the spec
handling core logic so people won't be confused by the core logic inside
the commands folder (cleaner I guess)
- Regen docs

commands/sys/cci.go

@@ -1,14 +1,14 @@
 package sys
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "cci",
 		Description: "CumulusCI command line interface",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "flow", Description: "Commands for finding and running flows for a project"},
 			{Name: "doc", Description: "Exports RST format documentation for all flows"},
 			{Name: "info", Description: "Displays information for a flow"},
@@ -49,7 +49,7 @@ func init() {
 			{Name: "project", Description: "Commands for interacting with project repository configurations"},
 			{Name: "init", Description: "Initialize a new project for use with the cumulusci toolbelt"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--project", Description: "Include project-specific flows only"},
 			{Name: "--help", Description: "Help for flow doc"},
 			{Name: "--plain", Description: "Print the table using plain ascii"},