* Install minio in /home/vadmeste/minio-dev by default
* Check for host architecutre before installing
* Check the minio dev directory before start
* env.sh is always in the root of minio-dev directory, use base dirname instead of hardcoded path
* Explain why we use main function in the script
* env.sh should not mess with GOROOT variable if already defined
* Force the user to set GOROOT var if golang is already installed
* Prettify the script output
* Hide pushd/popd output
Harshavardhana