Merge branch 'dev'

* dev:
  Update  conf docs in README
  Remove docs/conf.md
  Better configs comment docs
  Add docs comment to configs.toml
  Jslint fixes
  Add config item 'listener.blacklist'  #60
Changes for v0.4.5
Version 0.4.5
Add bell's own logger
Switch to bell's logger
Upgrade node-ssdb and remove bunyan deps
Remove useless util `startsWith`