Merge pull request #1 from sowawa/master

apply php-fig's coding rules
Use identical operator to make up for eqaul
split Event.php and EventData.php
Merge pull request #3 from sowawa/use_identical_operator

Use identical operator to make up for eqaul
Merge pull request #2 from sowawa/split_event_class_file

split Event.php and EventData.php
Setup .travis.yml
Add notification settings of Travis for WebPay development team
Create README.md
define accessor as Api interface