Verify SDK generator has been generated event classes for every schema available

[rjalander]

Create a test to validate the event class files generated by generator/pom.xml
The number of class files and names generated by generator/pom.xml should match with the number of schema files under sdk-java spec @ ffe67bb submodule

Note:
As per #60 (comment)

[rjalander]

Addressing this issue as part of SDK 0.3.0 generate PR, 1b40c6b

[rjalander]

Closing this as the issue addressed as part of PR #62