Implement storager

[junaire]

This is the first PR of my work. It intends to finish the tasks below:

• NewStorager
• formatError

General tracking issue #6

[Xuanwo]

It's OK for me to split our project into several PRs. Maybe we can set up a roadmap for it?

[junaire]

It's OK for me to split our project into several PRs. Maybe we can set up a roadmap for it?

My original thought is that open one PR and add more commits into it. You can review my work and merge the PR when our work is done. But it is OK if you prefer to split one PR into several ones and merge them one by one. As for the roadmap, I would like to open a new issue, and list all the work I need to finish. Finally we can close it when all of PRs get merged. What's your idea?

[Xuanwo]

As for the roadmap, I would like to open a new issue, and list all the work I need to finish. Finally we can close it when all of PRs get merged.

Great! Looks good to me.

[junaire]

It doesn't look too difficult to implement GSP-127, do you mind if I open a PR? @Xuanwo If @xxchan is too busy?

[Xuanwo]

It doesn't look too difficult to implement GSP-127, do you mind if I open a PR? @Xuanwo If @xxchan is too busy?

This is so great! Please feel free to send a PR for GSP-127.

[junaire]

Hey, I'm back! I finally finished my final exams and now I can work on the project full time! ;-) Besides, is this PR ready to be merged? Since we have finished GSP-127, it should pass the tests successfully. However, I don't know why I can't make it on my local machine. Is it because I should update the 3rd party packages manually? I have tried go get -u all, but it didn't work. :-( I'm sorry but I'm a newbie to the Go, and I'm little confused with the package management.

[xxchan]

You are using go-storage v4.2.0. Your GSP-127 implementation is on master, not released yet.

go get -u will try to use newer minor or patch releases when available.

Try go get github.com/beyondstorage/go-storage/v4@master

You can read:
https://golang.org/cmd/go/#hdr-Add_dependencies_to_current_module_and_install_them
https://xuanwo.io/2019/05/27/go-modules/