[Issue #15] Refactor existing job history parsing into factory model

(also deleting the job conf file test which was not doing anything)
[Issue #15] Refactor existing job history parsing into factory model

updating as per review suggestions
[Issue #15] checking in the modified filenames
updating the javadoc in the interface and the function prototype
updating the documentation to contain {@inheritDoc}
updating logging of exceptions, if checks and if coding style
Updating exceptions, documentation, formatting
Merge pull request #16 from vrushalic/hadoop1_parserFactory

[Issue #15] Refactor existing job history parsing into factory model