add test script
rename test method
log the object if running in test env
update readme
use constructor to initialize. use the  method to change config
add postmark key
Merge remote-tracking branch 'upstream/master' into develop

* upstream/master:
  add postmark key
  use constructor to initialize. use the  method to change config
  update readme
  log the object if running in test env
  rename test method
  add test script