Restructure the code for easy import

[wangchen615]

1. change the package management using dep
2. change the code structure for easy import as packages to reuse the functions defined in prioritize.go, etc.

Fix issue #8

[everpeace]

@wangchen615 Wow, Thank you for your great contribution. Looks great to me overall. Would you mind me requesting housekeeping tasks (mainly documentation) before merging this 🙇 ?

• Could you rename the package so that it fits this repo?
• Could you rewrite README to fit this repository (and delete README.org)? Please include the credit to your contribution.
• Could you include deployment example in README as previous? It would be better first touch for new commers.

[wangchen615]

Hi, @everpeace , thanks for the comments. Sorry for coming back to this late. I made the above changes, could you review again please?

[everpeace]

@wangchen615 Thanks for your adjustment work!! However, #10 was submitted recently and I merged it because it keeps using go module and I prefer this because go module is the current de-facto.

But, I think the ease of import is important as you pointed out. Thus, would you mind kindly re-working this pr so that this can still use go module?? I'm very happy if you could contribute.

Sorry for your inconvenience 🙇