Add getBucketLocation and getBucketInfo

[luozhang002]

1. add getBucketLoaction and getBucketInfo
2. add getBucketLoaction and getBucketInfo test case
3. add getBucketLoaction and getBucketInfo docs

[codecov-io]

Codecov Report

Merging #476 into master will increase coverage by 0.03%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #476      +/-   ##
==========================================
+ Coverage   96.88%   96.91%   +0.03%     
==========================================
  Files          12       12              
  Lines        1413     1427      +14     
  Branches      270      272       +2     
==========================================
+ Hits         1369     1383      +14     
  Misses         44       44

Impacted Files	Coverage Δ
lib/bucket.js	98.4% <100%> (+0.09%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9c5c735...5000b3e. Read the comment docs.