Added empty Junit tests for PDFUtilities.
Moved unit test classes to conventional directory.
Added Isator test manual as example PDF.
Added mechanism to get test file to unit tests.
Removed getPaths unit test.
Added tests for PDF file size tests.
Corrected file length check when passed by path.

Closes #10
Tidied up length check methods.
Merge pull request #11 from friesey/unit-testing

Added unit test framework and basic tests.