build: Add release builds, now generated with 'make release'

Currently supported platforms are

    - linux{amd64,arm,386}
    - winows{amd64,386}
    - darwin{amd64}

MAINTAINERS.md

@@ -34,4 +34,4 @@ $
 
 `minio` doesn't follow semantic versioning style, `minio` instead uses the release date and time as the release versions.
 
-`make release` will install new released binary into your `GOPATH`
+`make release` will generate new binary into `release` directory.