Update Makefile to follow build/install conventions for Go packages

.gitignore

@@ -15,5 +15,6 @@ tmtags
 
 # Builds and logs.
 mop
+bin/mop*
 logs/*
 

Makefile

@@ -1,8 +1,22 @@
+# Copyright (c) 2013-2016 by Michael Dvorkin. All Rights Reserved.
+# Use of this source code is governed by a MIT-style license that can
+# be found in the LICENSE file.
+
+VERSION = 0.2.0
+PACKAGE = github.com/michaeldv/mop/cmd/mop
+
 run:
-	go run ./cmd/mop.go
+	go run ./cmd/mop/main.go
 
 build:
-	go build ./cmd/mop.go
+	go build -x $(PACKAGE)
 
 install:
-	go install github.com/michaeldv/mop/cmd
+	go install -x $(PACKAGE)
+
+buildall:
+	GOOS=darwin  GOARCH=amd64 go build $(GOFLAGS) -o ./bin/mop-$(VERSION)-osx-64         $(PACKAGE)
+	GOOS=freebsd GOARCH=amd64 go build $(GOFLAGS) -o ./bin/mop-$(VERSION)-freebsd-64     $(PACKAGE)
+	GOOS=linux   GOARCH=amd64 go build $(GOFLAGS) -o ./bin/mop-$(VERSION)-linux-64       $(PACKAGE)
+	GOOS=windows GOARCH=amd64 go build $(GOFLAGS) -o ./bin/mop-$(VERSION)-windows-64.exe $(PACKAGE)
+	GOOS=windows GOARCH=386   go build $(GOFLAGS) -o ./bin/mop-$(VERSION)-windows-32.exe $(PACKAGE)