Rebuild ssdb: Add connection pool feature
Fix parser typo
Fix tests
Use connection pool sized 10
Fix some comments
Add test for connection pool simultaneous
v0.1.5
Update how to use bluebird Promise
Merge branch 'dev'

* dev:
  Update how to use bluebird Promise
  v0.1.5
  Add test for connection pool simultaneous
  Fix some comments
  Use connection pool sized 10
  Fix tests
  Fix parser typo
  Rebuild ssdb: Add connection pool feature