condition to catch and repair parsing of books with a single chapter

[JMNofziger]

Issue is described here: #1

Book objects with a single chapter did not contain the chapter within an array and would have an undefined length - checking for this condition allowed me to perform the necessary modification on only the affected books. The book object for Genesis is cloned to serve as a correctly parsed template and the clone then has its properties updated to hold the values of the affected book. The task then continues normally.

Tested locally. Manually checked a few books to confirm expected output to gh-pages, and confirmed that git status showed only the expected new directories/files were being created. I've included a file git-status-output.txt with the output from git after grunt convert --html was run with the new code changes.

I'm sure there's a resolution to be found at the point of parsing but I wanted to quickly submit a PR to simply get the missing chapters up on the gratis.bible webpages.

[JMNofziger]

excerpt from git-status-output.txt to preview the untracked files being created - this demonstrates the creation of the previously missing chapter output for single chapter books:

Untracked files:
  (use "git add <file>..." to include in what will be committed)
        af/afr3353/2john/1/
        af/afr3353/3john/1/
        af/afr3353/jude/1/
        af/afr3353/obad/1/
        af/afr3353/phlm/1/
        ar/arasvd/2john/1/
        ar/arasvd/3john/1/
        ar/arasvd/jude/1/
        ar/arasvd/obad/1/
        ar/arasvd/phlm/1/
        bg/bulcarigradnt/2john/1/
        bg/bulcarigradnt/3john/1/
        bg/bulcarigradnt/jude/1/
        bg/bulcarigradnt/phlm/1/
        bg/bulveren/2john/1/
        bg/bulveren/3john/1/
        bg/bulveren/jude/1/
        bg/bulveren/obad/1/
        bg/bulveren/phlm/1/
        cs/czbkr/2john/1/
        cs/czbkr/3john/1/
        cs/czbkr/jude/1/
[... and so on, and so forth... ]