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/js/truffle.go

@@ -1,14 +1,14 @@
 package js
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "truffle",
 		Description: "Execute build pipeline (if configuration present)",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "build", Description: "Execute build pipeline (if configuration present)"},
 			{Name: "compile", Description: "Compile contract source files"},
 			{Name: "config", Description: "Set user-level configuration options"},
@@ -41,7 +41,7 @@ func init() {
 			{Name: "box_name", Description: "Name of the Truffle Box. (required)"},
 			{Name: "test", Description: "Run JavaScript and Solidity tests"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--list", Description: "Compile all contracts instead of only the contracts changed since last compile"},
 			{Name: "--quiet", Description: "Suppress all compilation output"},
 			{Name: "--enable-analytics", Description: "Enable Truffle to send usage data to Google Analytics"},