Handle usfm blank lines before the Book ID USFM Marker + misc cleanup

[tonkapark]

A usfm file that has a blank line or extra spaces before the \id marker will cause the u2o.py script to fail generating the proper XML and revert to a TEST print out and an unused id marker.

Changes:

• Add script usage to README
• Created output directory for generated osis files and gitgnore files
• Created a test and included a sample usfm file that caused the failure

[adyeths]

I just added a commit that fixes this issue in a different way. I have to think about some of the other changes. I don't want to mess up anyone's workflow with changing the default output directory. Thanks!