Blake op2 book and collection

This pull will add a new collection for Blake's opus 2, including additional information on this work in an index.html file. Since the work was done to create a book from the individual parts of this work, some LilyPond code was included for a complete book with titling, TOC, a single-page bio, and complete opus.

Building the book:
The book code references the existing entries in the Mutopia archive so the build requires no copying. It does, however, require a command line that specifies the archived areas as include references. A simple shell script has been included (build.sh) that will build the book in a4 and letter formats.

```shell
$ cd $MUTOPIA_BASE/collections/blakeop2/blakeop2-lys
$ sh build.sh
$ mv *.pdf ..
```
Note that the PDF books must be in the same folder as the index.html file.